test(deps): update dependency bundler to v2.6.4 (main)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
bundler (source, changelog)	2.6.3 -> 2.6.4

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Release Notes

rubygems/rubygems (bundler)

v2.6.4

Compare Source

Enhancements:

• Make Bundler never instantiate development dependencies #​8486
• Fix some invalid options to gem DSL not getting reported as invalid #​8480
• Add irb to a Gemfile for a newly created gem #​8467
• Auto-heal empty installation directory #​8457
• Fix bundle console unnecessarily trying to load IRB twice #​8443
• Add ruby_34 and ruby_35 as valid platform: #​8430
• Consider gems under platform: :windows filter in Gemfile when running on Windows with ARM architecture #​8428

Bug fixes:

• Fix regression when running bundle update <foo> would sometimes downgrade a top level dependency #​8491
• Fix dependency locking when Bundler finds incorrect lockfile dependencies #​8489
• Raise error when lockfile is missing deps in frozen mode #​8483
• Fix bundle install --prefer-local sometimes installing very old versions #​8484
• Fix incorrect error message when running bundle update in frozen mode #​8481
• Keep platform variants in vendor/cache even if incompatible with the current Ruby version #​8471
• Fix bundle console printing bug report template incorrectly #​8436
• Fix --prefer-local not respecting default gems #​8412

Performance:

• Improve resolution performance #​8458

Documentation:

• Fix more broken links #​8416

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