ci: Pin peter-evans/create-pull-request to 98357b1 (v8)

Author: ValuedMammal

.github/workflows/cron-update-rust.yml

@@ -43,7 +43,7 @@ jobs:
           fi
       - name: Create Pull Request
         if: env.changes_made == 'true'
-        uses: peter-evans/create-pull-request@v8
+        uses: peter-evans/create-pull-request@98357b18bf14b5342f975ff684046ec3b2a07725 # v8.0.0
         with:
           token: ${{ steps.generate-token.outputs.token }}
           author: Github Action <[email protected]>