Update dependency rack to v3.1.6

[renovate[bot]]

This PR contains the following updates:

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

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Release Notes

rack/rack (rack)

### [`v3.1.6`](https://togithub.com/rack/rack/blob/HEAD/CHANGELOG.md#316---2024-07-03) [Compare Source](https://togithub.com/rack/rack/compare/v3.1.5...v3.1.6) - Fix several edge cases in `Rack::Request#parse_http_accept_header`'s implementation. ([#​2226](https://togithub.com/rack/rack/pull/2226), \[[@​ioquatix](https://togithub.com/ioquatix)])

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[yegor256]

@rultor please, try to merge, since 4 checks have passed

[rultor]

@rultor please, try to merge, since 4 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor please, try to merge, since 4 checks have passed

@yegor256 Done! FYI, the full log is here (took me 10min)