Downgrade setup-java action from v6 to v5

Author: Stephcraft

.github/workflows/docs.yml

@@ -31,7 +31,7 @@ jobs:
         # Install Java
         # https://github.com/actions/setup-java
       - name: Setup JDK
-        uses: actions/setup-java@v6
+        uses: actions/setup-java@v5
         with:
           distribution: temurin
           java-version: 17