Bump actions/upload-artifact from 5 to 6 (#470)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -35,7 +35,7 @@ jobs:
     - name: Lint (sqflint)
       uses: jokoho48/sqflint@master
       continue-on-error: true # No failure due to many false-positives
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       with:
        name: 'sqfLint Log'
        path: 'sqf.log'
@@ -59,7 +59,7 @@ jobs:
       - name: Run HEMTT build
         run: hemtt release
       - name: Upload Release
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: '@LambsDanger'
           path: '.hemttout/release/*'