Merge pull request #3 from cybozu/update-actions-version

approve されたのでマージ (権限の問題で森さんではマージできなかった)

Author: takahiro-yamada

.github/workflows/lint_and_tests.yml

@@ -12,7 +12,7 @@ jobs:
     timeout-minutes: 20
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: actions/setup-go@v2
         with: