Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci-post-merge.yml

@@ -36,7 +36,7 @@ jobs:
         if: matrix.target.os == 'macos-latest'
         run: sudo ifconfig lo0 alias 127.0.0.3
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Free Disk Space
         if: matrix.target.os == 'ubuntu-latest'
@@ -108,7 +108,7 @@ jobs:
     name: minimal versions
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust (nightly)
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
@@ -127,7 +127,7 @@ jobs:
     name: nextest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
         if: matrix.target.os == 'macos-latest'
         run: sudo ifconfig lo0 alias 127.0.0.3
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Free Disk Space
         if: matrix.target.os == 'ubuntu-latest'
@@ -121,7 +121,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust (nightly)
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0

.github/workflows/clippy-fmt.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
         with:
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
         with: { components: clippy }

.github/workflows/upload-doc.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
         with: { toolchain: nightly }