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/e2e-full.yml

@@ -35,7 +35,7 @@ jobs:
       matrix:
         device: [min, max]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Enable KVM
         run: |
@@ -92,7 +92,7 @@ jobs:
           - device: max
             os: macos-26
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup CocoaPods cache
         uses: actions/cache@v4
@@ -166,7 +166,7 @@ jobs:
             device: none
             os: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js with cache
         uses: actions/setup-node@v4

.github/workflows/pr-checks.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-24.04
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Devbox
         uses: jetify-com/devbox-install-action@v0.14.0
@@ -43,7 +43,7 @@ jobs:
     timeout-minutes: 30
     needs: fast-tests
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Enable KVM
         run: |
@@ -92,7 +92,7 @@ jobs:
     timeout-minutes: 25
     needs: fast-tests
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup CocoaPods cache
         uses: actions/cache@v4
@@ -157,7 +157,7 @@ jobs:
             device: none
             os: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js with cache
         uses: actions/setup-node@v4

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       mcp_bumped: ${{ steps.check-mcp.outputs.mcp_bumped }}
       mcp_version: ${{ steps.check-mcp.outputs.mcp_version }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -92,7 +92,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v4