Update .github/workflows/javadoc.yaml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: zeevmoney

.github/workflows/javadoc.yaml

@@ -10,7 +10,7 @@ jobs:
   javadoc:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-java@v3.11.0
         with:
           java-version: '8'