Bump protobuf from 3.5.2 to 3.14.0

[dependabot-preview]

Bumps protobuf from 3.5.2 to 3.14.0.

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.14.0

Protocol Compiler

• The proto compiler no longer requires a .proto filename when it is not generating code.
• Added flag --deterministic_output to protoc --encode=....
• Fixed deadlock when using google.protobuf.Any embedded in aggregate options.

C++

• Arenas are now unconditionally enabled. cc_enable_arenas no longer has any effect.
• Removed inlined string support, which is incompatible with arenas.
• Fix a memory corruption bug in reflection when mixing optional and non-optional fields.
• Make SpaceUsed() calculation more thorough for map fields.
• Add stack overflow protection for text format with unknown field values.
• FieldPath::FollowAll() now returns a bool to signal if an out-of-bounds error was encountered.
• Performance improvements for Map.
• Minor formatting fix when dumping a descriptor to .proto format with DebugString.
• UBSAN fix in RepeatedField (#2073).
• When running under ASAN, skip a test that makes huge allocations.
• Fixed a crash that could happen when creating more than 256 extensions in a single message.
• Fix a crash in BuildFile when passing in invalid descriptor proto.
• Parser security fix when operating with CodedInputStream.
• Warn against the use of AllowUnknownExtension.
• Migrated to C++11 for-range loops instead of index-based loops where possible. This fixes a lot of warnings when compiling with -Wsign-compare.
• Fix segment fault for proto3 optional (#7805)
• Adds a CMake option to build libprotoc separately (#7949)

Java

• Bugfix in mergeFrom() when a oneof has multiple message fields.
• Fix RopeByteString.RopeInputStream.read() returning -1 when told to read 0 bytes when not at EOF.
• Redefine remove(Object) on primitive repeated field Lists to avoid autoboxing.
• Support "\u" escapes in textformat string literals.
• Trailing empty spaces are no longer ignored for FieldMask.
• Fix FieldMaskUtil.subtract to recursively remove mask.
• Mark enums with @java.lang.Deprecated if the proto enum has option deprecated = true;.
• Adding forgotten duration.proto to the lite library (#7738)

Python

• Print google.protobuf.NullValue as null instead of "NULL_VALUE" when it is used outside WKT Value/Struct.
• Fix bug occurring when attempting to deep copy an enum type in python 3.
• Add a setuptools extension for generating Python protobufs (#7783)

Commits

• 2514f0b Removed protoc-artifacts/target directory
• f3192d6 Update protobuf version
• 8630972 Updated CHANGES.txt to add #8035
• e91922a Additional test
• e57f761 Fix parsing negative Int32Value that crosses segment boundary
• 1b851b3 Update protobuf version
• 129a5ed Updated CHANGES.txt to include #7928
• 99149ba Fix PyUnknownFields memory leak (#7928)
• 4928583 Updated CHANGES.txt for the 3.14.0 release
• fbbe11a Reintroduced definitions for PHP GeneratedClassName() functions
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[dependabot-preview]

Superseded by #147.