Update CI workflow to use latest actions and add caching for Flutter …

…dependencies; add Dependabot configuration for automated updates

.github/dependabot.yml

@@ -0,0 +1,22 @@
+version: 2
+updates:
+  # Check for updates to pub dependencies in oui package
+  - package-ecosystem: "pub"
+    directory: "/oui"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+
+  # Check for updates to pub dependencies in oui_showcase
+  - package-ecosystem: "pub"
+    directory: "/oui_showcase"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+
+  # Check for updates to GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10

.github/workflows/ci.yml

@@ -14,13 +14,22 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup Flutter SDK
         uses: flutter-actions/setup-flutter@v3
         with:
           channel: stable
-          version: 3.0.2
+
+      - name: Cache Flutter
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.pub-cache
+            ${{ github.workspace }}/.flutter
+          key: ${{ runner.os }}-flutter-${{ hashFiles('**/pubspec.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-flutter-
 
       - name: Install dependencies
         run: flutter pub get
@@ -32,20 +41,10 @@ jobs:
         run: flutter test --coverage
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage/lcov.info
           flags: unittests
           name: codecov-umbrella
           fail_ci_if_error: true
-
-      - name: Cache Flutter
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.pub-cache
-            ${{ github.workspace }}/.flutter
-          key: ${{ runner.os }}-flutter-${{ hashFiles('**/pubspec.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-flutter-