Upgrade to actions/checkout@v2 (#2661)

Author: hsubox76

.github/workflows/cross-browser-test.yml

@@ -17,7 +17,7 @@ jobs:
       SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Use Node.js 10.x
       uses: actions/setup-node@v1
       with:

.github/workflows/test-all.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Set up Node (10)
       uses: actions/setup-node@v1
       with:
@@ -47,7 +47,7 @@ jobs:
     needs: test
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Set up Node (10)
       uses: actions/setup-node@v1
       with:

.github/workflows/test-changed.yml

@@ -8,7 +8,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+    - name: Checkout
+      run: |
+        git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*
     - name: Set up Node (10)
       uses: actions/setup-node@v1
       with: