[CI] Bump to "actions/checkout@v3"

Author: phansys

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Cache DB2 library
         id: cache-clidriver
         uses: actions/cache@v2
@@ -123,7 +123,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Cache DB2 library
         id: cache-clidriver
         uses: actions/cache@v2