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/CI.yml

@@ -9,7 +9,7 @@ jobs:
   Cinnamon:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Free up disk space for the CI
         uses: AdityaGarg8/remove-unwanted-software@v5
@@ -81,7 +81,7 @@ jobs:
   MATE:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Free up disk space for the CI
         uses: AdityaGarg8/remove-unwanted-software@v5
@@ -145,7 +145,7 @@ jobs:
   XFCE:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Free up disk space for the CI
         uses: AdityaGarg8/remove-unwanted-software@v5
@@ -212,7 +212,7 @@ jobs:
     steps:
 
       - name: 'Checkout Repo'
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Generate Variables
         run: |