ci: use self-hosted octo-sts

Author: mkraeml

.github/workflows/prepare_release.yml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         RELEASE_BRANCH: ${{ fromJSON(vars.RELEASE_BRANCHES) }}
     steps:
-      - uses: octo-sts/action@main
+      - uses: shopware/octo-sts-action@main
         id: octo-sts
         with:
           scope: shopware/SwagLanguagePack

.github/workflows/translations.yml

@@ -33,7 +33,7 @@ jobs:
         with:
           shopware-version: ${{ steps.shopware-branch.outputs.branch }}
 
-      - uses: octo-sts/action@main
+      - uses: shopware/octo-sts-action@main
         id: octo-sts
         with:
           scope: shopware/SwagLanguagePack