Fix cache-retention workflow to reference the right reusable workflow (#101)

Author: jeffhandley

.github/workflows/labeler-cache-retention.yml

@@ -10,4 +10,4 @@ jobs:
   cache-retention:
     # Do not run the workflow on forks outside the 'dotnet' org
     if: ${{ github.repository_owner == 'dotnet' }}
-    uses: dotnet/issue-labeler/.github/workflows/build-predictor.yml@f0c098669828a134c0313adf3f58c1909e555d86 # v1.0.1
+    uses: dotnet/issue-labeler/.github/workflows/cache-retention.yml@f0c098669828a134c0313adf3f58c1909e555d86 # v1.0.1