Bump flutter_markdown from 0.6.20 to 0.7.3 in /uni

Bumps [flutter_markdown](https://github.com/flutter/packages/tree/main/packages) from 0.6.20 to 0.7.3.
- [Release notes](https://github.com/flutter/packages/releases)
- [Commits](https://github.com/flutter/packages/commits/flutter_markdown-v0.7.3/packages)

---
updated-dependencies:
- dependency-name: flutter_markdown
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

uni/pubspec.lock

@@ -495,10 +495,10 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_markdown
-      sha256: "04c4722cc36ec5af38acc38ece70d22d3c2123c61305d555750a091517bbe504"
+      sha256: "2e8a801b1ded5ea001a4529c97b1f213dcb11c6b20668e081cafb23468593514"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.23"
+    version: "0.7.3"
   flutter_secure_storage:
     dependency: "direct main"
     description:

uni/pubspec.yaml

@@ -35,7 +35,7 @@ dependencies:
     sdk: flutter
   flutter_map: ^5.0.0
   flutter_map_marker_popup: ^5.0.0
-  flutter_markdown: ^0.6.0
+  flutter_markdown: ^0.7.3
   flutter_secure_storage: ^9.0.0
   flutter_svg: ^2.0.9
   flutter_widget_from_html_core: ^0.14.11