Bump the github-actions group with 2 updates

Closes #16

GitOrigin-RevId: b2d79ce
Change-Id: I49e01f931d7869ee722c72647297ec80bdab1acd
Reviewed-on: https://dart-review.googlesource.com/c/flute/+/366480
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>

.github/workflows/ci.yaml

@@ -20,9 +20,9 @@ jobs:
           echo "Running on ${{ runner.os }}"
           echo "Branch: ${{ github.ref }}; repo: ${{ github.repository }}."
       - name: Fetch sources
-        uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b
       - name: Install Dart SDK
-        uses: dart-lang/setup-dart@fedb1266e91cf51be2fdb382869461a434b920a3
+        uses: dart-lang/setup-dart@f0ead981b4d9a35b37f30d36160575d60931ec30
         with:
           sdk: ${{ matrix.sdk }}
       - name: Pub get