Update actions/checkout from v1 to v2 (#1134)

Update the version of the checkout action in Github CI runner.

Signed-off-by: Emily Mabrey <[email protected]>

Author: emabrey

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
             cargo_cmd: clippy --locked --all-targets -- -D warnings -A unknown-lints -A clippy::type_complexity -A clippy::new-without-default
     steps:
       - name: Clone repository
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Install rust
         uses: ./.github/actions/rust-toolchain
@@ -69,7 +69,7 @@ jobs:
       RUST_BACKTRACE: 1
     steps:
       - name: Clone repository
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Install rust
         uses: ./.github/actions/rust-toolchain
@@ -113,7 +113,7 @@ jobs:
             rustflags: -Ctarget-feature=+crt-static
     steps:
       - name: Clone repository
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Install rust
         uses: ./.github/actions/rust-toolchain
@@ -185,7 +185,7 @@ jobs:
       RUST_BACKTRACE: 1
     steps:
       - name: Clone repository
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Install rust
         uses: ./.github/actions/rust-toolchain
@@ -234,7 +234,7 @@ jobs:
     if: ${{ startsWith(github.ref, 'refs/tags/') }}
     steps:
       - name: Clone repository
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Get artifacts
         uses: actions/download-artifact@v2