Bump rack-cache from 1.15.0 to 1.16.0

[dependabot[bot]]

Bumps rack-cache from 1.15.0 to 1.16.0.

Release notes

Sourced from rack-cache's releases.

v1.16.0

What's Changed

• Typo in meta_store_test.rb test description [ci skip] by @​olleolleolle in rack/rack-cache#23
• Purge cache_key if response headers do not include content digest by @​evman182 in rack/rack-cache#22
• Remove memcached gem. by @​ioquatix in rack/rack-cache#24

New Contributors

• @​evman182 made their first contribution in rack/rack-cache#22

Full Changelog: https://github.com/rack/rack-cache/compare/v1.15.0...v1.16.0

Commits

• 3f7e08c Bump minor version.
• c00bfd5 Fix JRuby.
• ffee6b7 Drop support for old rubies.
• 9eb2f8d Add missing mutex_m gem.
• 21f6840 Remove memcached gem.
• 4344620 Purge cache_key if response headers do not include content digest (#22)
• ebc5fa1 Typo in meta_store_test.rb test description [ci skip] (#23)
• See full diff in compare view

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[coveralls]

coverage: 78.236%. remained the same when pulling f062af26303cde16ef3ea286f3ee5f6b7e75a586 on dependabot/bundler/rack-cache-1.16.0 into 5763bcf04a9cfd57742492d1ded03e72d00099b8 on master.

[dependabot[bot]]

Superseded by #2352.