Update javadoc.yml

Author: mikebarkmin

Diff for: .github/workflows/javadoc.yml

@@ -24,7 +24,7 @@ jobs:
       - uses: actions/setup-java@v2
         with:
           distribution: 'temurin'
-          java-version: '17'
+          java-version: '21'
       - name: Build with Maven
         run: ant -f resources/build.xml
       - name: Setup Pages
@@ -35,4 +35,4 @@ jobs:
           path: distribution/javadoc
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v4