Update dart-lang/setup-dart digest to c1b2cdb

Author: renovate[bot]

.github/workflows/dart.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
-      - uses: dart-lang/setup-dart@7f54cd0cee53e120db0d1fce4196b7772ebd6f6e
+      - uses: dart-lang/setup-dart@c1b2cdbfafc77480d10fe0246ef4dd2f83a9e7b7
         with:
           sdk: main
           flavor: raw