Bump actions/checkout from 3 to 4

.github/workflows/bench.yml

@@ -13,7 +13,7 @@ jobs:
     name: Performance regression check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/prepare
       - name: Run benchmark
         run: cargo bench -- --output-format bencher | tee output.txt

.github/workflows/book.yml

@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: nightly

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
             extra_flags: --features nightly
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: prepare
         uses: ./.github/actions/prepare
       - name: Run tests
@@ -46,7 +46,7 @@ jobs:
             name_suffix: " with nightly features"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: prepare
         uses: ./.github/actions/prepare
         with:
@@ -74,7 +74,7 @@ jobs:
           - wasm32-wasi
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: prepare
         uses: ./.github/actions/prepare
         with:
@@ -95,7 +95,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # Check bitrot with stable (as we don't need benchmarks or the test-dev-graph
       # feature flag to work with MSRV).
       - uses: ./.github/actions/prepare
@@ -112,7 +112,7 @@ jobs:
     name: Book tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/prepare
       - name: cargo build
         uses: actions-rs/cargo@v1
@@ -130,7 +130,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # Use stable for this to ensure that cargo-tarpaulin can be built.
       - id: prepare
         uses: ./.github/actions/prepare
@@ -158,7 +158,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/prepare
       - name: cargo fetch
         uses: actions-rs/cargo@v1
@@ -178,7 +178,7 @@ jobs:
     timeout-minutes: 30
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/prepare
       - run: rustup component add rustfmt
       - uses: actions-rs/cargo@v1

.github/workflows/lints-beta.yml

@@ -12,7 +12,7 @@ jobs:
     continue-on-error: true
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: prepare
         uses: ./.github/actions/prepare
         with:

.github/workflows/lints-stable.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: prepare
         uses: ./.github/actions/prepare
         with: