build(deps): bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/linux.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install Qt
         uses: jurplel/install-qt-action@v4

.github/workflows/macos.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: macos-15-intel
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install Qt
         uses: jurplel/install-qt-action@v4
@@ -63,7 +63,7 @@ jobs:
     runs-on: macos-14
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install Qt
         uses: jurplel/install-qt-action@v4

.github/workflows/windows.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: windows-2022
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install Qt
         uses: jurplel/install-qt-action@v4