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/0-start-exercise.yml

@@ -30,10 +30,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit

.github/workflows/1-step.yml

@@ -29,10 +29,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit
@@ -143,10 +143,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit

.github/workflows/2-step.yml

@@ -27,10 +27,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit
@@ -122,9 +122,9 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit

.github/workflows/3-step.yml

@@ -29,10 +29,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit
@@ -143,10 +143,10 @@ jobs:
       ISSUE_URL: ${{ needs.find_exercise.outputs.issue-url }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit

.github/workflows/4-step.yml

@@ -28,10 +28,10 @@ jobs:
       ISSUE_URL: ${{ needs.find_exercise.outputs.issue-url }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get response templates
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: skills/exercise-toolkit
           path: exercise-toolkit

.github/workflows/5-step.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Create comment - add step content
         run: |
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Disable current workflow
         run: gh workflow disable "${{github.workflow}}"
         env: