Update actions/checkout action to v4

Author: taiki-e

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
         rust: [nightly, beta, stable]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
         run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
@@ -60,7 +60,7 @@ jobs:
         target:
           - x86_64-pc-windows-gnu
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
         run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
@@ -81,7 +81,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Rust
       run: rustup update stable
     - name: Install cross
@@ -121,7 +121,7 @@ jobs:
         # Rust version in Cargo.toml.
         rust: ['1.63']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
         run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
@@ -130,15 +130,15 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup update stable
       - run: cargo clippy --all-features --all-targets
 
   fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Rust
         run: rustup update stable
       - run: cargo fmt --all --check
@@ -150,7 +150,7 @@ jobs:
       issues: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # https://github.com/rustsec/audit-check/issues/2
       - uses: rustsec/audit-check@master
         with:

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.repository_owner == 'smol-rs'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: taiki-e/create-gh-release-action@v1
         with:
           changelog: CHANGELOG.md