CI: 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](https://github.com/actions/checkout/compare/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>

.github/workflows/dev-container.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3

.github/workflows/flatpak-template.yml

@@ -19,7 +19,7 @@ jobs:
       options: --privileged
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: flatpak/flatpak-github-actions/flatpak-builder@v6
         with:
           bundle: Ladybird.flatpak

.github/workflows/js-and-wasm-artifacts.yml

@@ -45,7 +45,7 @@ jobs:
 
     steps:
       - name: Checkout LadybirdBrowser/ladybird
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ inputs.reference_to_build }}
 

.github/workflows/js-and-wasm-benchmarks.yml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
       - name: 'Checkout LadybirdBrowser/js-benchmarks'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: LadybirdBrowser/js-benchmarks
           path: js-benchmarks

.github/workflows/lagom-template.yml

@@ -44,10 +44,10 @@ jobs:
       # Pull requests can trail behind `master` and can cause breakage if merging before running the CI checks on an updated branch.
       # Luckily, GitHub creates and maintains a merge branch that is updated whenever the target or source branch is modified. By
       # checking this branch out, we gain a stabler `master` at the cost of reproducibility.
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         if: ${{ github.event_name != 'pull_request' }}
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         if: ${{ github.event_name == 'pull_request' }}
         with:
           ref: refs/pull/${{ github.event.pull_request.number }}/merge

.github/workflows/libjs-test262.yml

@@ -22,28 +22,28 @@ jobs:
           rm -rf "${{ github.workspace }}/*"
 
       - name: Checkout LadybirdBrowser/ladybird
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Checkout LadybirdBrowser/libjs-test262
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: LadybirdBrowser/libjs-test262
           path: libjs-test262
 
       - name: Checkout LadybirdBrowser/libjs-data
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: LadybirdBrowser/libjs-data
           path: libjs-data
 
       - name: Checkout tc39/test262
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: tc39/test262
           path: test262
 
       - name: Checkout tc39/test262-parser-tests
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: tc39/test262-parser-tests
           path: test262-parser-tests

.github/workflows/lint-code.yml

@@ -8,7 +8,7 @@ jobs:
     if: github.repository == 'LadybirdBrowser/ladybird'
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set Up Environment
         shell: bash

.github/workflows/nightly-android.yml

@@ -27,7 +27,7 @@ jobs:
         os: [macos-14]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set Up Environment
         uses: ./.github/actions/setup

.github/workflows/notes-push.yml

@@ -11,7 +11,7 @@ jobs:
     if: github.repository == 'LadybirdBrowser/ladybird'
     runs-on: blacksmith-2vcpu-ubuntu-2404
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: fregante/setup-git-user@v2