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/ci.yml

@@ -75,7 +75,7 @@ jobs:
       SUFFIX: linux-${{ matrix.arch }}
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: true
       - name: Install packages
@@ -138,7 +138,7 @@ jobs:
       SUFFIX: macos-${{ matrix.arch }}
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: true
       - name: Install packages
@@ -211,7 +211,7 @@ jobs:
         run: git config --system core.autocrlf false
         shell: bash
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: true
       - uses: msys2/setup-msys2@v2
@@ -265,7 +265,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: true
       - name: Install packages
@@ -300,7 +300,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/jq-')
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Download executables
         uses: actions/download-artifact@v3
         with:
@@ -361,7 +361,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/jq-')
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Download artifacts
         uses: actions/download-artifact@v3
       - name: Upload release

.github/workflows/decnum.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: true
       - name: Install packages

.github/workflows/manpage.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Setup Python
         uses: actions/setup-python@v5
         with:

.github/workflows/oniguruma.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install packages
         run: |
           sudo apt-get update
@@ -44,7 +44,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install packages
         run: |
           sudo apt-get update

.github/workflows/scanbuild.yml

@@ -23,7 +23,7 @@ jobs:
                       cflags: ''
         steps:
             - name: Clone repository
-              uses: actions/checkout@v4
+              uses: actions/checkout@v6
             - name: Open Submodule(s)
               run: |
                 git submodule update --init --recursive

.github/workflows/valgrind.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Clone repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: true
       - name: Install packages

.github/workflows/website.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Setup Python