bump to checkout v4

Author: sjoerdsimons

.github/workflows/ci.yml

@@ -11,15 +11,15 @@ jobs:
     name: cargo check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/[email protected]
       - run: cargo check --all-targets --all-features
 
   fmt:
     name: cargo fmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/[email protected]
         with:
           components: rustfmt
@@ -29,15 +29,15 @@ jobs:
     name: cargo test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/[email protected]
       - run: cargo test --all-targets --all-features
 
   clippy:
     name: cargo clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/[email protected]
         with:
           components: clippy
@@ -47,7 +47,7 @@ jobs:
     name: cargo clippy latest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy
@@ -73,7 +73,7 @@ jobs:
       packages: write
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: docker/login-action@v1
         with: