Update module github.com/gin-gonic/gin to v1.9.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/gin-gonic/gin	replace	patch	v1.9.0 -> v1.9.1

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Release Notes

gin-gonic/gin (github.com/gin-gonic/gin)

v1.9.1

Compare Source

BUG FIXES

• fix Request.Context() checks #​3512

SECURITY

• fix lack of escaping of filename in Content-Disposition #​3556

ENHANCEMENTS

• refactor: use bytes.ReplaceAll directly #​3455
• convert strings and slices using the officially recommended way #​3344
• improve render code coverage #​3525

DOCS

• docs: changed documentation link for trusted proxies #​3575
• chore: improve linting, testing, and GitHub Actions setup #​3583

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