Use self-repository syntax in Maven mirrors E2E

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 59df028a-0d1b-49cb-8126-ab26408663e4

.github/workflows/e2e-publishing.yml

@@ -189,7 +189,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Configure Maven mirrors without repository inputs
-        uses: ./
+        uses: $/
         with:
           distribution: 'temurin'
           java-version: '21'