Update bundler requirement from ~> 1.16 to ~> 2.2

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Updates the requirements on bundler to permit the latest version.

Release notes

Sourced from bundler's releases.

bundler-v2.2.4

Bug fixes:

• Fix bundle man pages display on truffleruby #4209
• Fix Windows + JRuby no longer being able to install git sources #4196

Changelog

Sourced from bundler's changelog.

2.2.3 (December 22, 2020)

Bug fixes:

• Restore full compatibility with previous lockfiles #4179
• Add all matching variants with the same platform specificity to the lockfile #4180
• Fix bundler installing gems for a different platform when running in frozen mode and current platform not in the lockfile #4172
• Fix crash when bundle exec'ing to bundler #4175

2.2.2 (December 17, 2020)

Bug fixes:

• Fix resolver crash when a candidate has 0 matching platforms #4163
• Restore change to copy global with/without config locally upon bundle install #4154

2.2.1 (December 14, 2020)

Bug fixes:

• Ad-hoc fix for platform regression #4127
• Workaround JRuby + Windows issue with net-http-persistent vendored code #4138
• Reset also root when in a nested invocation #4140
• Restore 2.1.4 resolution times #4134
• Fix bundle outdated --strict crash #4133
• Autoload Bundler::RemoteSpecification to workaround crash on jruby #4114

2.2.0 (December 7, 2020)

Enhancements:

• New gem template: prefer require_relative to require #4066
• Always show underlying error when fetching specs fails #4061
• Add --all-platforms flag to bundle binstubs to generate binstubs for all platforms #3886
• Improve gem not found in source error messages #4019
• Revert resolving all Gemfile platforms automatically #4052
• Remove extra empty line from README template #4041
• Lazily load erb #4011

Bug fixes:

• Fix Bundler::Plugin::API::Source#to_s having empty source type #4084
• Raise consistent errors with or without bundle exec #4063
• Fix edge case resulting in a crash when using zeitwerk inside a nested bundle exec invocation #4062
• Enable specific_platform by default #4015
• Prevent remove command from deleting gemfile lines that are comments #4045
• Fix issue with cache_all_platforms and specific_platform configured #4042
• Fix incorrect error message on Windows #4039
• Make printed drive letters consistent on Windows #4038
• Load rubygems plugins from RUBYLIB during bundle install and bundle update #3534

Commits

• 529e536 Merge pull request #4212 from rubygems/release/bundler_2.2.4_rubygems_3.2.4
• 05bffe7 Bump Rubygems version to 3.2.4
• 9fbacf6 Changelog for Rubygems version 3.2.4
• b38ca1c Bump Bundler version to 2.2.4
• 0d2b988 Changelog for Bundler version 2.2.4
• 68f6a4f Merge pull request #4213 from rubygems/fix_index_fallback
• 095358c Merge pull request #4209 from rubygems/fix_bundle_man_pages_display_on_truffl...
• 56efcd2 Merge pull request #4168 from rubygems/markdown_changelog
• e0e49df Merge pull request #4196 from rubygems/no_subshells_for_git_commands
• 9d650b8 Merge pull request #4201 from rubygems/fix_head_install_on_truffleruby
• Additional commits viewable in compare view

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