chore(deps): 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/flake-checker.yml

@@ -13,7 +13,7 @@ jobs:
     name: Flake Checker
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: DeterminateSystems/nix-installer-action@v21

.github/workflows/flake-updater.yml

@@ -10,7 +10,7 @@ jobs:
     name: Flake Lock Updater
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: DeterminateSystems/nix-installer-action@v21

.github/workflows/lint-shellcheck.yml

@@ -10,7 +10,7 @@ jobs:
     name: Shellcheck
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master
         with:

.github/workflows/publish-release.yml

@@ -16,7 +16,7 @@ jobs:
     name: "Check versions ⚖️"
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: "Compare App and Git versions 🟰"
@@ -37,7 +37,7 @@ jobs:
     name: "Build Release 👨‍🔧"
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: "Build .deb 🍥"
       env:
         DEBFULLNAME: "Martin Wimpress"
@@ -69,7 +69,7 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: "actions/checkout@v5"
+      - uses: "actions/checkout@v6"
         with:
           ref: "${{ (inputs.tag != null) && format('refs/tags/{0}', inputs.tag) || '' }}"
       - uses: "DeterminateSystems/nix-installer-action@main"
@@ -86,7 +86,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: "Checkout 🥡"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Container Buildx

.github/workflows/scan-container.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3

.github/workflows/test-build-stream-sprout.yml

@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
     - name: "Checkout 🥡"
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: "Build & Test .deb 🍥"
       env:
         DEBFULLNAME: "Martin Wimpress"
@@ -55,7 +55,7 @@ jobs:
       contents: "read"
     steps:
       - name: "Checkout 🥡"
-        uses: "actions/checkout@v5"
+        uses: "actions/checkout@v6"
       - name: "Install Nix ❄️"
         uses: "DeterminateSystems/nix-installer-action@v21"
       - name: "Enable Magic Nix Cache 🪄"
@@ -69,7 +69,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: "Checkout 🥡"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Container Buildx
@@ -103,7 +103,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout 🥡
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Build snap 🐊
         uses: snapcore/action-build@v1
         id: snapcraft