Bump dart-lang/setup-dart from 1.5.0 to 1.5.1

Closes #6

GitOrigin-RevId: f688e67
Change-Id: Iacda1b09dd67f64e9e150c3f1bd2a5b2e33a7da8
Reviewed-on: https://dart-review.googlesource.com/c/flute/+/329000
Commit-Queue: Alexander Thomas <athom@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>

.github/workflows/ci.yaml

@@ -18,7 +18,7 @@ jobs:
       - name: Fetch sources
         uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
       - name: Install Dart SDK
-        uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
         with:
           sdk: 2.15.0-268.18.beta
       - name: Pub get