chore(deps): bump actions/upload-artifact from 3 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v3...v7)

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

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

.github/workflows/firmware-qemu.yml

@@ -73,7 +73,7 @@ jobs:
           echo "QEMU binary size: $(file_size /opt/qemu-esp32/bin/qemu-system-xtensa) bytes"
 
       - name: Upload QEMU artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: qemu-esp32
           path: /opt/qemu-esp32/
@@ -203,7 +203,7 @@ jobs:
 
       - name: Upload test logs
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: qemu-logs-${{ matrix.nvs_config }}
           path: |
@@ -253,7 +253,7 @@ jobs:
 
       - name: Upload fuzz artifacts
         if: failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: fuzz-crashes
           path: |
@@ -370,7 +370,7 @@ jobs:
 
       - name: Upload swarm results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: swarm-results
           path: |