chore(deps): bump @fastify/static from 8.0.2 to 8.1.1

Bumps [@fastify/static](https://github.com/fastify/fastify-static) from 8.0.2 to 8.1.1.
- [Release notes](https://github.com/fastify/fastify-static/releases)
- [Commits](fastify/fastify-static@v8.0.2...v8.1.1)

---
updated-dependencies:
- dependency-name: "@fastify/static"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/backend/package.json

@@ -79,7 +79,7 @@
 		"@fastify/express": "4.0.1",
 		"@fastify/http-proxy": "10.0.1",
 		"@fastify/multipart": "9.0.1",
-		"@fastify/static": "8.0.2",
+		"@fastify/static": "8.1.1",
 		"@fastify/view": "10.0.1",
 		"@misskey-dev/sharp-read-bmp": "1.2.0",
 		"@misskey-dev/summaly": "5.1.0",