chore(deps): bump actions/download-artifact from 3 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v6)

---
updated-dependencies:
- dependency-name: actions/download-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/ci.yml

@@ -241,7 +241,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Download XCFramework
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v6
         with:
           name: WidgetDevelopmentKit.xcframework
           path: build
@@ -270,7 +270,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Download Documentation
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v6
         with:
           name: documentation
           path: docs