Comment version that is pinned

Co-authored-by: Michael B. Gale <mbg@github.com>

Author: henrymercer

.github/workflows/label-pr-size.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Run sizeup
-        uses: lerebear/sizeup-action@b7beb3dd273e36039e16e48e7bc690c189e61951
+        uses: lerebear/sizeup-action@b7beb3dd273e36039e16e48e7bc690c189e61951 # 0.8.12
         with:
           token: "${{ secrets.GITHUB_TOKEN }}"
           configuration-file-path: ".github/sizeup.yml"