chore: Bump actions/checkout from 6 to 7 (#164)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release-plz.yml

@@ -18,7 +18,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
@@ -45,7 +45,7 @@ jobs:
       cancel-in-progress: false
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 

.github/workflows/rust.yml

@@ -28,7 +28,7 @@ jobs:
     name: ${{ matrix.target }} (debug)
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: Swatinem/rust-cache@v2
 
     - name: Add target
@@ -61,7 +61,7 @@ jobs:
     name: ${{ matrix.target }} (release)
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: Swatinem/rust-cache@v2
 
     - name: Add target
@@ -81,7 +81,7 @@ jobs:
     name: MSRV Build
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: Swatinem/rust-cache@v2
 
     - name: Get MSRV
@@ -104,7 +104,7 @@ jobs:
     name: Code guidelines
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: Update Rust
       run: |
@@ -126,6 +126,6 @@ jobs:
     name: Linelint
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: fernandrone/linelint@0.0.6
         id: linelint