chore(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/ci.yml

@@ -25,7 +25,7 @@ jobs:
     timeout-minutes: 10
     continue-on-error: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: oven-sh/setup-bun@v2
         with:
           bun-version: "1.3.11"
@@ -46,7 +46,7 @@ jobs:
       TURBO_TOKEN: ${{ secrets.TURBO_TOKEN }}
       TURBO_TEAM: ${{ vars.TURBO_TEAM }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: oven-sh/setup-bun@v2
         with:
           bun-version: "1.3.11"
@@ -124,7 +124,7 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 2
       - uses: oven-sh/setup-bun@v2

.github/workflows/codeql.yml

@@ -23,7 +23,7 @@ jobs:
       contents: read
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3

.github/workflows/dependency-review.yml

@@ -12,7 +12,7 @@ jobs:
   dependency-review:
     runs-on: blacksmith-2vcpu-ubuntu-2404
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/dependency-review-action@v4
         with:
           comment-summary-in-pr: always

.github/workflows/docker-publish.yml

@@ -49,7 +49,7 @@ jobs:
             description: "Databuddy Uptime service - availability monitoring"
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Mount Docker build cache
         uses: useblacksmith/stickydisk@v1

.github/workflows/health-check.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Mount Docker build cache
         uses: useblacksmith/stickydisk@v1
@@ -138,7 +138,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Mount Docker build cache
         uses: useblacksmith/stickydisk@v1