Bump actions/checkout from 4 to 6 (#35)

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

Author: dependabot[bot]

.github/workflows/alpha.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone project
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Package
         uses: BigWigsMods/packager@v2

.github/workflows/docs.yml

@@ -6,10 +6,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone project
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Clone wiki
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: ${{ github.repository }}.wiki
           path: .wiki

.github/workflows/license.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone project
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Update license year
         uses: p3lim/license-year-updater@v2

.github/workflows/lint.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Run luacheck
         uses: nebularg/actions-luacheck@v1

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone project
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Trim changelog
         run: sed -ni '1p;2,/^###/{/^###/q;p;}' CHANGELOG.md

.github/workflows/version.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone project
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Update TOC Interface version
         uses: p3lim/toc-interface-updater@v4