Bump dart-lang/setup-dart from 1.4.0 to 1.5.0

Closes https://github.com/dart-lang/homebrew-dart/pull/139

GitOrigin-RevId: 17d27ecae10d05f51b1ff04a4d2534d25696f2f4
Change-Id: I0773acb06edca05f6e75c3be03cde7a1a8059bda
Reviewed-on: https://dart-review.googlesource.com/c/homebrew-dart/+/292602
Reviewed-by: Jonas Termansen <sortie@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>
diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 49b5b91..e687fd6 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml
@@ -21,7 +21,7 @@
         sdk: [dev, stable]
     steps:
       - uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3
-      - uses: dart-lang/setup-dart@a57a6c04cf7d4840e88432aad6281d1e125f0d46
+      - uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
         with:
           sdk: ${{ matrix.sdk }}
       - id: install