chore(deps): bump actions/upload-artifact from 5 to 6

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] <[email protected]>

Author: dependabot[bot]

.github/workflows/qmk.yml

@@ -64,15 +64,15 @@ jobs:
           qmk info -m -l -kb hineybush/h60 -km haunt98
           qmk info -m -l -kb sofle/rev1 -km haunt98
       - name: Archive firmware
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: haunt98_firmware_${{ matrix.qmk_ref }}
           path: |
             *.hex
             *.bin
             *.uf2
       - name: Archive keymaps JSON
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: haunt98_keymaps_${{ matrix.qmk_ref }}
           path: |