use checkout@v2

Author: klensy

.github/workflows/ci.yml

@@ -622,7 +622,7 @@ jobs:
     if: "github.event_name == 'push' && github.ref == 'refs/heads/master' && github.repository == 'rust-lang-ci/rust'"
     steps:
       - name: checkout the source code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
         with:
           fetch-depth: 2
       - name: publish toolstate

src/ci/github-actions/ci.yml

@@ -655,7 +655,7 @@ jobs:
     if: github.event_name == 'push' && github.ref == 'refs/heads/master' && github.repository == 'rust-lang-ci/rust'
     steps:
       - name: checkout the source code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
         with:
           fetch-depth: 2