Update dependency rack to v3.1.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rack (changelog)	'3.1.6' -> '3.1.8'
rack (changelog)	'3.1.5' -> '3.1.8'

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Release Notes

rack/rack (rack)

v3.1.8

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Fixed

• Resolve deprecation warnings about uri DEFAULT_PARSER. (#​2249, [@​earlopain])

v3.1.7

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Fixed

• Do not remove escaped opening/closing quotes for content-disposition filenames. (#​2229, [@​jeremyevans])
• Fix encoding setting for non-binary IO-like objects in MockRequest#env_for. (#​2227, [@​jeremyevans])
• Rack::Response should not generate invalid content-length header. (#​2219, [@​ioquatix])
• Allow empty PATH_INFO. (#​2214, [@​ioquatix])

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