Use actions/checkout@v2

.github/workflows/main.yml

@@ -10,7 +10,7 @@ jobs:
         os: [ubuntu-latest, windows-latest]
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
         with:
           fetch-depth: 1
 
@@ -46,7 +46,7 @@ jobs:
         os: [ubuntu-latest, windows-latest]
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
         with:
           fetch-depth: 1
 

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
     # TODO Share steps with the main workflow.
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
 
       - uses: actions/setup-node@v1
         with: