test(deps): update dependency bundler to v2.5.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
bundler (source, changelog)	2.5.6 -> 2.5.7

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Release Notes

rubygems/rubygems (bundler)

v2.5.7

Compare Source

Deprecations:

• Deprecate bundle plugin install --local-git= #​7048

Enhancements:

• Ignore commented out keys in config file #​7514
• Fix exclusion of .gemspec file itself in bundle gem generated gemspec file #​7488
• Remove redundant configs from bundle gem generated rubocop configuration #​7478
• Add gitlab: git source shorthand #​7449
• Use full path for instance_eval in Bundler::DSL#eval_gemfile #​7471

Documentation:

• Use https instead of http in documentation links #​7481

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