Bump subosito/flutter-action from 1 to 2 in the github-actions group (dart-lang#99)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/dart_tooling_mcp_server.yaml

@@ -32,7 +32,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
       # We need the flutter SDK in order to run the counter app for integration
       # testing.
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@v2
         with:
           channel: ${{ matrix.flutterSdk }}
           cache: true