Update actions/checkout action from vv4 to v5

Author: renovate[bot]

.github/workflows/push.yml

@@ -15,7 +15,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'ci skip')"
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - name: Install xmlstarlet
@@ -64,7 +64,7 @@ jobs:
     needs: [maven-package]
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - name: Install xmlstarlet