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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout ♻️
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python 🏭
         uses: actions/setup-python@v6
@@ -95,7 +95,7 @@ jobs:
     needs: build
     steps:
       - name: Checkout ♻️
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download built artifact ⌛
         uses: actions/download-artifact@v5

.github/workflows/comment_on_issues.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Create Issues comment
         id: comment
@@ -218,7 +218,7 @@ jobs:
     needs: build
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download built artifact
         uses: actions/cache/restore@v4

.github/workflows/custom_build.yml

@@ -57,7 +57,7 @@ jobs:
     if: github.event.repository.fork == false
     steps:
       - name: Checkout ♻️
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python 👷
         uses: actions/setup-python@v6
@@ -122,7 +122,7 @@ jobs:
     needs: build
     steps:
       - name: Checkout ♻️
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download built artifact ⌛
         uses: actions/cache/restore@v4

.github/workflows/shellcheck.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Run ShellCheck
       id: check

.github/workflows/update.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout ♻️
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Dependencies 🧑‍🏭
         run: |