Update dependency rack to v3.1.5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rack (changelog)	'3.1.4' -> '3.1.5'

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Release Notes

rack/rack (rack)

### [`v3.1.5`](https://togithub.com/rack/rack/blob/HEAD/CHANGELOG.md#315---2024-07-02) [Compare Source](https://togithub.com/rack/rack/compare/v3.1.4...v3.1.5) ##### Security - Fix potential ReDoS attack in `Rack::Request#parse_http_accept_header`. ([GHSA-cj83-2ww7-mvq7](https://togithub.com/rack/rack/security/advisories/GHSA-cj83-2ww7-mvq7), [@​dwisiswant0](https://togithub.com/dwisiswant0))

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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 9min)