Update maven-publish-snapshots.yml

Adds one missing "continue-on-error: true"

Author: FrankSchnicke

.github/workflows/maven-publish-snapshots.yml

@@ -61,6 +61,7 @@ jobs:
 
     - name: Delete old dataformat-rdf package
       uses: actions/delete-package-versions@v1
+      continue-on-error: true
       with:
         package-name: 'io.admin-shell.aas.dataformat-rdf'