Update bundler requirement from ~> 2.0.2 to ~> 2.2.8

[dependabot-preview]

Updates the requirements on bundler to permit the latest version.

Release notes

Sourced from bundler's releases.

bundler-v2.2.8

Enhancements:

• Add a CHANGELOG.md file to gems generated by bundle gem #4093
• Support gemified set #4297

Bug fixes:

• Fix standalone Kernel.require visibility #4337

Performance:

• Fix resolver edge cases and speed up bundler #4277

Changelog

Sourced from bundler's changelog.

2.2.7 (January 26, 2021)

Enhancements:

• Improve error messages when dependency on bundler conflicts with running version #4308
• Avoid showing platforms with requirements in error messages #4310
• Introduce disable_local_revision_check config #4237
• Reverse rubygems require mixin with bundler standalone #4299

Bug fixes:

• Fix releasing from a not yet pushed branch #4309
• Install cache only once if it already exists #4304
• Fix force_ruby_platform no longer being respected #4302

Performance:

• Fix resolver dependency comparison #4289

2.2.6 (January 18, 2021)

Enhancements:

• Improve resolver debugging #4288

Bug fixes:

• Fix dependency locking for path source #4293

Performance:

• Speed up complex dependency resolves by creating DepProxy factory and cache #4216

2.2.5 (January 11, 2021)

Enhancements:

• Improve rubocop setup in the new gem template #4220
• Support repositories with default branch not named master #4224

Bug fixes:

• Let Net::HTTP decompress the index instead of doing it manually #4081
• Workaround for another jruby crash when autoloading a constant #4252
• Fix another performance regression in the resolver #4243
• Restore support for old git versions #4233
• Give a proper error if cache path does not have write access #4215
• Fix running rake release from an ambiguous ref #4219

2.2.4 (December 31, 2020)

... (truncated)

Commits

• 4015e55 Merge pull request #4340 from rubygems/release/bundler_2.2.8_rubygems_3.2.8
• 0e52622 Bump Rubygems version to 3.2.8
• ed9cb59 Changelog for Rubygems version 3.2.8
• 3fdd951 Bump Bundler version to 2.2.8
• 8d09ba6 Changelog for Bundler version 2.2.8
• 4d92773 Merge pull request #4334 from pbernays/fix-nil-required-ruby-version
• ae80f88 Merge pull request #4093 from jlgoedert/master
• b165884 Merge pull request #4337 from aaronjensen/fix-standalone-kernel-require
• 597ba7c Merge pull request #4235 from rubygems/simplecov
• 6abd97d Merge pull request #4332 from rubygems/speedup_platform_specific_specs
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #35.