feat: use checkout v2

Author: technote-space

.github/workflows/check_version.yml

@@ -5,7 +5,7 @@ jobs:
     name: Check package version
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
         with:
           fetch-depth: 3
       - name: Check package version

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     name: ESLint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
         with:
           fetch-depth: 3
       - name: Get Yarn Cache Directory
@@ -46,7 +46,7 @@ jobs:
       matrix:
         node: ['10', '11', '12']
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
         with:
           fetch-depth: 3
       - name: Setup node

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
         with:
           fetch-depth: 3
       - name: Cache node modules
@@ -42,7 +42,7 @@ jobs:
     needs: test
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
         with:
           fetch-depth: 3
       - name: Setup Node.js