Update tests

Author: hwdsl2

.github/workflows/cron.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-20.04
     if: github.repository_owner == 'hwdsl2'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # 2.4.0
         with:
           persist-credentials: false
       - name: Check

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-20.04
     if: github.repository_owner == 'hwdsl2'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # 2.4.0
         with:
           persist-credentials: false
       - name: Check
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-20.04
     if: github.repository_owner == 'hwdsl2'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # 2.4.0
         with:
           persist-credentials: false
       - name: Check