build: (deps): bump flutter_webrtc from 1.1.0 to 1.2.0

Bumps [flutter_webrtc](https://github.com/cloudwebrtc/flutter-webrtc) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/cloudwebrtc/flutter-webrtc/releases)
- [Changelog](https://github.com/flutter-webrtc/flutter-webrtc/blob/main/CHANGELOG.md)
- [Commits](https://github.com/cloudwebrtc/flutter-webrtc/compare/v1.1.0...v1.2.0)

---
updated-dependencies:
- dependency-name: flutter_webrtc
  dependency-version: 1.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pubspec.lock

@@ -301,10 +301,10 @@ packages:
     dependency: transitive
     description:
       name: dart_webrtc
-      sha256: a2ae542cdadc21359022adedc26138fa3487cc3b3547c24ff4f556681869e28c
+      sha256: "51bcda4ba5d7dd9e65a309244ce3ac0b58025e6e1f6d7442cee4cd02134ef65f"
       url: "https://pub.dev"
     source: hosted
-    version: "1.5.3+hotfix.4"
+    version: "1.6.0"
   dbus:
     dependency: transitive
     description:
@@ -704,10 +704,10 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_webrtc
-      sha256: "945d0a38b90fbca8257eadb167d8fb9fa7075d9a1939fd2953c10054454d1de2"
+      sha256: "16ca9e30d428bae3dd32933e875c9f67c5843d1fa726c37cf1fc479eb9294549"
       url: "https://pub.dev"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   frontend_server_client:
     dependency: transitive
     description: