build(deps): update magnus requirement from 0.7.1 to 0.8.1 in /ext/app_bridge

[dependabot]

Updates the requirements on magnus to permit the latest version.

Release notes

Sourced from magnus's releases.

0.8.1

Magnus 0.8.1 is a patch release, with 1 bug fix.

Fixes a compilation error on 32-bit platforms. Thanks to @​jonian for reporting this issue.

See the 0.8.0 release for what's new in 0.8.

Changelog

Sourced from magnus's changelog.

[0.8.1] - 2025-09-06

Fixed

• Fixed error compiling on 32-bit platforms.

[0.8.0] - 2025-08-25

Added

• Ruby::time_nano_new, Ruby::time_timespec_new, and Time::timespec.
• The chrono feature can be enabled to allow automatic conversions between chrono::DateTime<Utc> and chrono::DateTime<FixedOffset> and Ruby Time objects.
• typed_data::Writebarrier::writebarrier and writebarrier_unprotect.
• Implement TryConvert for NonZero types.
• io module available with io feature, supporting io_extract_modeenc, OpenFlags, FMode, and IoEncoding.
• Ruby::io_extract_modeenc, a safe wrapper around rb_io_extract_modeenc, allowing structured extraction of open flags, mode flags, and IO encoding metadata.
• OpenFlags struct, which wraps Ruby's O_ open flags (e.g. O_RDONLY, O_CREAT) in a convenient bitflag-like interface.
• FMode struct, representing FMODE_ flags used internally by Ruby to represent IO modes (READ, WRITE, BINARY_MODE, etc.).
• IoEncoding, a safe Rust struct for temporarily owning and inspecting rb_io_encoding, including safe accessors for internal/external encoding and encoding options.
• Automatic type conversions to/from i128/u128.
• to_i128/to_u128 for Fixnum/Bignum/Integer.
• Ruby::integer_from_i128 & Ruby::integer_from_u128.
• RHash::to_btree_map and automatic conversion from Hash to BTreeMap.

Changed

• Minimum supported Rust version is now 1.65.
• Conversions between Ruby's Time and Rust's SystemTime now preserve nanosecond precision.
• 'old-api' feature, which disables deprecation warnings for the old api is no longer a default feature.
• RString::to_string will now use a Ruby utf-8 validation api that caches the results of the validity check. This will greatly improve performance in the case a string is already known to be utf-8, but may slightly reduce performance when not known.
• RString::to_interned_str now returns an RString rather than an FString.

Deprecated

• thread_fd_close as it will be a no-op as of Ruby 3.5

Removed

• FString as it can not safely uphold the promise it was making. Either due to Ruby's apis changing or a misinterpretation of old documentation it had been designed assuming interned strings (aka fstrings) would not be garbage collected, which is not the case.
• RString::as_interned_str as its only purpose was to return an FString.

... (truncated)

Commits

• 6bbb0e2 bump version to 0.8.1
• 020eb2d fix for 32bit platforms
• 8fd9288 update changelog for 0.8.0 release
• 108c87e Merge pull request #154 from sandbergja/singleton-typo
• 5347568 Fix typo: singlton should be singleton
• 56bb429 update examples in magnus-macros
• 16c1cc9 better fix for change in rb_fiber_raise
• 00db8b1 fix doc
• 5adb4d2 fix warnings introduced in newer rustc
• 619c27e remove FString
• 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 show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @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]

Superseded by #96.