Update opm-maker.yml

Author: richieri

.github/workflows/opm-maker.yml

@@ -27,7 +27,7 @@ jobs:
       id: get_version
       run: echo ::set-output name=VERSION::$(grep '<Version>' Custom/*.sopm | sed -r 's/.+>(.+)<.+/\1/')
 
-    - uses: rlespinasse/github-slug-action@master
+    - uses: rlespinasse/github-slug-action@1.1.1
     - name: Print slug variables
       run: |
         echo ${{ env.GITHUB_REF_SLUG }}