build(deps): bump actions/upload-artifact in the github-actions group

Bumps the github-actions group with 1 update: [actions/upload-artifact](https://github.com/actions/upload-artifact).


Updates `actions/upload-artifact` from 6 to 7
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Build
         run: make -k -j2 ARCH=aarch64-linux-gnu- CHAINLOADING=1
 
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: m1n1
           path: |

.github/workflows/installer.yml

@@ -89,7 +89,7 @@ jobs:
           cd out
           zip -r uefi-only-${{ env.GIT_DATE }}-${{ env.KERNEL_REF }}.zip esp
 
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@v7
         with:
           name: ci-uefi-only-${{ env.GIT_DATE }}-${{ env.KERNEL_REF }}
           path: |