set content type on msix bundle when uploading as a release asset

Describe the feature
Right now we're using a github action to create new releases and upload the release assets. We want the msixbundle to have the content type application/msixbundle
The docs here, indicate that we can tell github what content type to use by setting a Content-Type header when uploading the file.

The workflow that needs to change is
https://github.com/sillsdev/languageforge-lexbox/blob/53ec30e195984d9dcd2b3a07b0d8a1a122ca3ec0/.github/workflows/fw-lite.yaml#L310-L321

we're using the softprops/action-gh-release action to generate the release, in their docs, they output the upload URL which we can use the upload to. So we would want to modify our current release and remove the bundle file from the current action and upload it in a follow up step.

Start with .github/workflows/fw-lite.yaml lines 310-321, then read the softprops/action-gh-release output documentation and GitHub's release asset upload documentation linked in the issue. Remove the MSIX bundle from the current release action and upload it in a follow-up step using the upload URL with Content-Type set to application/msixbundle.