Make the matrix-ios-sdk a submodule and use it as a local pod instead of a published one.

.github/workflows/ci-ui-tests.yml

@@ -20,7 +20,9 @@ jobs:
       cancel-in-progress: true
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
+        with:
+            submodules: 'true'
 
       # Common cache
       # Note: GH actions do not support yaml anchor yet. We need to duplicate this for every job
@@ -49,8 +51,6 @@ jobs:
         run: |
           bundle config path vendor/bundle
           bundle install --jobs 4 --retry 3
-      - name: Use right MatrixSDK versions
-        run: bundle exec fastlane point_dependencies_to_related_branches
 
       # Main step
       - name: UI tests