github ci: update checkout action to v4

The v3 release of the checkout action relies on
node16 which is deprecated, thus switch to the
current major version which moved on to node20.

Signed-off-by: Sven Hoexter <[email protected]>
Signed-off-by: Namjae Jeon <[email protected]>

.github/workflows/c-cpp.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: before test
       run: |
         sudo apt-get install linux-headers-$(uname -r)