Bump dart-lang/setup-dart from 1.6.5 to 1.7.0

Closes #59640

GitOrigin-RevId: 2420863
Change-Id: If1a85c7a93804bbe696b57bf9aae84664008126b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/398122
Reviewed-by: Alexander Thomas <[email protected]>

Author: dependabot[bot]

.github/workflows/issue-triage.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           repository: dart-lang/ecosystem
 
-      - uses: dart-lang/setup-dart@0a8a0fc875eb934c15d08629302413c671d3f672
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
 
       - run: dart pub get
         working-directory: pkgs/sdk_triage_bot