PDFBOX-5660: update to v4 as suggested by copilot

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1926570 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

.github/workflows/codeql-analysis.yml

@@ -44,14 +44,14 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.
         fetch-depth: 2
 
     - name: Cache local Maven repository
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.m2/repository
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}