github/workflows: update runs-on to ubuntu-22 and actions@checkout to v4

Signed-off-by: Koichi Shiraishi <[email protected]>

Author: zchee

.github/workflows/test.yml renamed to .github/workflows/test.yaml

@@ -14,11 +14,11 @@ env:
 jobs:
   test:
     name: test
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Test in Docker
       run: |