chore(ci): bump actions/checkout to v3 (#4200)

Author: trivikr

.github/workflows/codegen-ci.yml

@@ -15,7 +15,7 @@ jobs:
         java: [8, 11] 
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v1