feat: Add unified push as push provider

pubspec.yaml

@@ -15,6 +15,12 @@ dependencies:
       url: https://gitlab.com/famedly/famedlysdk.git
       ref: main
 
+  unifiedpush:
+#    path: /home/sorunome/repos/gotify/flutter_unified_push
+    git:
+      url: https://github.com/UnifiedPush/flutter-connector.git
+      ref: main
+
   localstorage: ^3.0.6+9
   file_picker_cross: 4.2.2
   image_picker: ^0.6.7+21
@@ -35,7 +41,11 @@ dependencies:
   flutter_secure_storage: ^3.3.5
   http: ^0.12.2
   universal_html: ^1.2.4
-  receive_sharing_intent: ^1.4.3
+  receive_sharing_intent:
+    # see https://github.com/KasemJaffer/receive_sharing_intent/pull/115
+    git:
+      url: https://github.com/radvansky-tomas/receive_sharing_intent.git
+      ref: 107ea4ae3c3da15be4e6d3337623b69cc2e04c68
   flutter_slidable: ^0.5.7
   flutter_sound_lite: ^7.5.3+1
   open_file: ^3.0.3