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] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yaml

@@ -40,7 +40,7 @@ jobs:
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: "${{ github.event.pull_request.head.sha }}"
       - run: |

.github/workflows/build_and_test_arm.yaml

@@ -25,7 +25,7 @@ jobs:
       FLAVOR: ${{ inputs.flavor }}
       ARCH: aarch64
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: |
           git fetch --prune --unshallow
       - name: Cached ISO
@@ -65,7 +65,7 @@ jobs:
       FLAVOR: ${{ inputs.flavor }}
       ARCH: aarch64
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: |
           git fetch --prune --unshallow
       - name: Checks cached Disk
@@ -117,7 +117,7 @@ jobs:
           - test-smoke
       fail-fast: false
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Go
         uses: actions/setup-go@v6
         with:
@@ -168,7 +168,7 @@ jobs:
       ARCH: aarch64
       COS_TIMEOUT: 1600
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Go
         uses: actions/setup-go@v6
         with:

.github/workflows/build_and_test_x86.yaml

@@ -24,7 +24,7 @@ jobs:
       ARCH: x86_64
       VERSION: ${{ inputs.version }} 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: "${{ github.event.pull_request.head.sha }}"
       - run: |
@@ -70,7 +70,7 @@ jobs:
       ARCH: x86_64
       VERSION: ${{ inputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: "${{ github.event.pull_request.head.sha }}"
       - run: |
@@ -116,7 +116,7 @@ jobs:
       ARCH: x86_64
       VERSION: ${{ inputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: "${{ github.event.pull_request.head.sha }}"
       - run: |
@@ -186,7 +186,7 @@ jobs:
         test: ${{ fromJson(needs.detect.outputs.tests) }}
       fail-fast: false
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: "${{ github.event.pull_request.head.sha }}"
       - name: Install Go
@@ -255,7 +255,7 @@ jobs:
       COS_TIMEOUT: 1600
       VERSION: ${{ inputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: "${{ github.event.pull_request.head.sha }}"
       - name: Install Go

.github/workflows/cache-cleanup.yaml

@@ -22,7 +22,7 @@ jobs:
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: "${{ github.event.pull_request.head.sha }}"
       - run: |

.github/workflows/cli.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install Go
         uses: actions/setup-go@v6
         with:

.github/workflows/docs-publish.yaml

@@ -20,7 +20,7 @@ jobs:
       - name: Install Dart Sass
         run: sudo snap install dart-sass
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
           fetch-depth: 0

.github/workflows/nightly.yaml

@@ -15,7 +15,7 @@ jobs:
       PLATFORM: x86_64
       TOOLKIT_REPO: ghcr.io/${{github.repository}}/elemental-cli 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: |
           git fetch --prune --unshallow
       - name: Log in to ghcr.io

.github/workflows/push-images.yaml

@@ -25,7 +25,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
         with:
           install: true
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.inputs.ref }}
       - run: |