Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Get build information from build.toml
       id: info
       run: |
@@ -61,7 +61,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Cache bzip2
       id: cache
       uses: actions/cache@v4
@@ -109,7 +109,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Cache libffi
       id: cache
       uses: actions/cache@v4
@@ -176,7 +176,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Cache XZ Utils
       id: cache
       uses: actions/cache@v4
@@ -242,7 +242,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       id: py
       uses: actions/setup-python@v5
@@ -306,7 +306,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Download artifacts
       uses: actions/download-artifact@v4
       with:
@@ -338,7 +338,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Download artifacts
       uses: actions/download-artifact@v4
       with:
@@ -415,7 +415,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Download Python.framework for iphoneos
       uses: actions/download-artifact@v4
       with:

.github/workflows/clear-cache.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout ${{ github.repository }}
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Clear all cache
       run: gh cache delete -a
       env: