chore(deps): update dependency fastify to v5.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
fastify (source)	5.12.0 → 5.12.1

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Release Notes

fastify/fastify (fastify)

v5.12.1

Compare Source

⚠️ Security release

• Fix for GHSA-w2qp-rph6-63g4
• Fix for GHSA-3m5p-2c4r-xxw2

What's Changed

• [Backport 5.x] test: fix reply.mediaType by @​github-actions[bot] in #​6950
• [Backport 5.x] ci: allow backport in pr title by @​github-actions[bot] in #​6952
• [Backport 5.x] fix: run preClose hook exactly once per declaring instance by @​github-actions[bot] in #​6954
• [Backport 5.x] fix: report canonical route url for hidden prefix slash route by @​github-actions[bot] in #​6961

Full Changelog: fastify/fastify@v5.12.0...v5.12.1

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