Bump google_maps_flutter from 2.1.4 to 2.1.5 in /flutter_maps_firestore (#1240)

Bumps [google_maps_flutter](https://github.com/flutter/plugins) from 2.1.4 to 2.1.5.
- [Release notes](https://github.com/flutter/plugins/releases)
- [Commits](https://github.com/flutter/plugins/compare/google_maps_flutter-v2.1.4...google_maps_flutter-v2.1.5)

---
updated-dependencies:
- dependency-name: google_maps_flutter
  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

@@ -127,7 +127,7 @@ packages:
       name: google_maps_flutter
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.4"
+    version: "2.1.5"
   google_maps_flutter_platform_interface:
     dependency: transitive
     description: