Bump cloud_firestore from 3.1.11 to 3.1.12 in /flutter_maps_firestore (#1083)

Bumps [cloud_firestore](https://github.com/FirebaseExtended/flutterfire) from 3.1.11 to 3.1.12.
- [Release notes](https://github.com/FirebaseExtended/flutterfire/releases)
- [Changelog](https://github.com/firebase/flutterfire/blob/master/CHANGELOG.md)
- [Commits](https://github.com/FirebaseExtended/flutterfire/compare/cloud_firestore-v3.1.11...cloud_firestore-v3.1.12)

---
updated-dependencies:
- dependency-name: cloud_firestore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

flutter_maps_firestore/pubspec.lock

@@ -42,21 +42,21 @@ packages:
       name: cloud_firestore
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.11"
+    version: "3.1.12"
   cloud_firestore_platform_interface:
     dependency: transitive
     description:
       name: cloud_firestore_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.5.2"
+    version: "5.5.3"
   cloud_firestore_web:
     dependency: transitive
     description:
       name: cloud_firestore_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.6.11"
+    version: "2.6.12"
   collection:
     dependency: transitive
     description: