Update dependency rack-test to v2.2.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rack-test (changelog)	2.1.0 -> 2.2.0

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Release Notes

rack/rack-test (rack-test)

v2.2.0

Compare Source

• Bug fixes:

  • Rack::Test::Cookie now parses cookie parameters using a
    case-insensitive approach (Guillaume Malette #​349)

• Minor enhancements:

  • Arrays of cookies containing a blank cookie are now handled
    correctly when processing responses. (Martin Emde #​343)
  • Rack::Test::UploadedFile no longer uses a finalizer for named
    paths to close and unlink the created Tempfile. Tempfile itself
    uses a finalizer to close and unlink itself, so there is no
    reason for Rack::Test::UploadedFile to do so (Jeremy Evans #​338)

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