PR-check:use actions/checkout, update actions/java to v4

The git redirect is left behind in self-hosted runners, which is not a
good idea.

update also actions/java to v4.

.github/workflows/PR-check.yml

@@ -14,7 +14,7 @@ jobs:
       PDM_BINARY_ARTIFACTS_DIR: pdm-binary-artifacts    
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-java@v3
+      - uses: actions/setup-java@v4
         with:
           java-version: "8"
           distribution: "temurin"
@@ -47,12 +47,13 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
         - uses: actions/checkout@v4
-        - name: Get scripts internal...
-          run: | 
-                git config --global url."https://${{ secrets.ACCESS_TOKEN }}@github.com/".insteadOf "[email protected]:"
-                git clone [email protected]:PelionIoT/scripts-internal.git
+        - uses: actions/checkout@v4
+          with:
+            repository: 'PelionIoT/scripts-internal'
+            token: ${{ secrets.ACCESS_TOKEN }}
+            path: 'scripts-internal'
         - name: Run no-more-lines w pysh-check 
           run: |
                 sudo apt install pycodestyle pydocstyle black
-                echo "." >scripts-internal/.nopyshcheck
+                touch scripts-internal/.nopyshcheck
                 scripts-internal/ci/more-lines-checker.sh ${{ github.event.repository.default_branch }} ${{ github.ref_name }} "scripts-internal/pysh-check/pysh-check.sh  --workdir ."