Revert "use main (#11081)" (#11082)

This reverts commit 6dfebc3.

Author: gewarren

.github/workflows/labeler-train.yml

@@ -111,7 +111,7 @@ jobs:
     permissions:
       pull-requests: read
       actions: write
-    uses: dotnet/issue-labeler/.github/workflows/download-pulls.yml@main
+    uses: dotnet/issue-labeler/.github/workflows/download-pulls.yml@f0c098669828a134c0313adf3f58c1909e555d86 # v1.0.1
     with:
       data_cache_key: ${{ inputs.cache_key_suffix }}
       pull_limit: ${{ inputs.data_limit && fromJSON(inputs.data_limit) || 0 }}