fix: add GStreamer deps for Linux build, update codec2_flutter to vendored source

.github/workflows/build-artifacts.yml

@@ -71,7 +71,9 @@ jobs:
             ninja-build \
             pkg-config \
             libgtk-3-dev \
-            liblzma-dev
+            liblzma-dev \
+            libgstreamer1.0-dev \
+            libgstreamer-plugins-base1.0-dev
 
       - name: Setup Flutter
         uses: subosito/flutter-action@v2

pubspec.lock

@@ -134,7 +134,7 @@ packages:
     description:
       path: "."
       ref: HEAD
-      resolved-ref: "062e5ce332353750ec43cc336f958a964a0d5000"
+      resolved-ref: "8b0c621bd84deb50d98ad4f2c4b819e0268210d4"
       url: "https://github.com/dz0ny/codec2_flutter.git"
     source: git
     version: "0.1.0"