Pin check-spelling commit

Author: msimberg

.github/workflows/spelling.yaml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - name: check-spelling
       id: spelling
-      uses: check-spelling/check-spelling@prerelease
+      uses: check-spelling/check-spelling@2d5f9dd9d2d43584d36e4ae03a3508eff411eda9
       with:
         suppress_push_for_open_pull_request: ${{ github.actor != 'dependabot[bot]' && 1 }}
         checkout: true
@@ -56,7 +56,7 @@ jobs:
     if: (success() || failure()) && needs.spelling.outputs.followup && contains(github.event_name, 'pull_request')
     steps:
     - name: comment
-      uses: check-spelling/check-spelling@prerelease
+      uses: check-spelling/check-spelling@2d5f9dd9d2d43584d36e4ae03a3508eff411eda9
       with:
         checkout: true
         task: ${{ needs.spelling.outputs.followup }}