Revert actions/checkout to v2 (#426)

This reverts #425

Author: spenserblack

.github/workflows/cd.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2
 
       - name: Install Rust
         uses: actions-rs/toolchain@v1

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
         rust: [stable, nightly]
 
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v2
 
     - name: Restore cargo cache
       uses: actions/[email protected]
@@ -48,7 +48,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v2
     - name: Install Rust
       uses: actions-rs/toolchain@v1
       with:
@@ -60,7 +60,7 @@ jobs:
     name: Security audit
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v2
     - uses: actions-rs/audit-check@v1
       with:
         token: ${{ secrets.GITHUB_TOKEN }}