Fixes
https://linear.app/zed-industries/issue/Z-2391/text-within-h-isnt-highlighted-the-same-as-in-heex-files
Fixes
https://linear.app/zed-industries/issue/Z-2415/syntax-highlighting-bug-in-strings

Release Notes:

- Fixed some issues with syntax highlighting in Elixir and Heex.

If the release notes are only intended for a specific release channel
only, add `(<release_channel>-only)` to the end of the release note
line.
These will be removed by the person making the release.