Update actions/checkout action to v4

.gitea/workflows/repod.yml

@@ -5,7 +5,7 @@ jobs:
   xml:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: wget https://raw.githubusercontent.com/nextcloud/appstore/master/nextcloudappstore/api/v1/release/info.xsd
       - uses: ChristophWurst/xmllint-action@v1
         with:
@@ -18,7 +18,7 @@ jobs:
     steps:
       - run: apt-get update
       - run: apt-get install -y git nodejs
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: curl -sSLo /usr/local/bin/composer https://getcomposer.org/download/latest-stable/composer.phar
       - run: chmod +x /usr/local/bin/composer
       - run: composer install
@@ -29,7 +29,7 @@ jobs:
   nodejs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: skjnldsv/read-package-engines-version-actions@v2
         id: versions
         with: