chore(deps): bump @google-cloud/firestore from 8.0.0 to 8.1.0 in /src

Bumps [@google-cloud/firestore](https://github.com/googleapis/nodejs-firestore) from 8.0.0 to 8.1.0.
- [Release notes](https://github.com/googleapis/nodejs-firestore/releases)
- [Changelog](https://github.com/googleapis/nodejs-firestore/blob/main/CHANGELOG.md)
- [Commits](googleapis/nodejs-firestore@v8.0.0...v8.1.0)

---
updated-dependencies:
- dependency-name: "@google-cloud/firestore"
  dependency-version: 8.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/package-lock.json

@@ -15,7 +15,7 @@
     "run": "docker run -p 8080:8080 report-api"
   },
   "dependencies": {
-    "@google-cloud/firestore": "8.0.0",
+    "@google-cloud/firestore": "8.1.0",
     "@google-cloud/functions-framework": "^4.0.0",
     "@google-cloud/storage": "7.18.0"
   },