Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -27,7 +27,7 @@ jobs:
     steps:
 
     - name: 📥 Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: 📂 Load .env file
       if: hashFiles('.github/workflows/.env') != ''

.github/workflows/linux.yml

@@ -62,7 +62,7 @@ jobs:
     steps:
 
     - name: 📥 Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: 📂 Load .env file
       if: hashFiles('.github/workflows/.env') != ''

.github/workflows/macOS.yml

@@ -60,7 +60,7 @@ jobs:
         - '4.1'
     steps:
     - name: 📥 Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: 📂 Load .env file
       if: hashFiles('.github/workflows/.env') != ''

.github/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
 
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Upload CMakeMM to release
       uses: svenstaro/[email protected]

.github/workflows/windows.yml

@@ -62,7 +62,7 @@ jobs:
     steps:
 
     - name: 📥 Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: 📂 Load .env file
       if: hashFiles('.github/workflows/.env') != ''