build(deps): 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/main.yml

@@ -19,7 +19,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v6
 
             -   name: Install
                 uses: ./.github/actions/install
@@ -33,7 +33,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v6
             -   name: Install
                 uses: ./.github/actions/install
                 with:
@@ -49,7 +49,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v6
 
             -   name: Install
                 uses: ./.github/actions/install
@@ -70,7 +70,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v6
 
             -   name: Install
                 uses: ./.github/actions/install
@@ -92,7 +92,7 @@ jobs:
         if: ${{ github.ref_name == 'master' }}
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v6
 
             -   name: Install
                 uses: ./.github/actions/install
@@ -124,7 +124,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             -   name: Checkout
-                uses: actions/checkout@v4
+                uses: actions/checkout@v6
                 with:
                     fetch-depth: 0