Bump convert from 3.1.1 to 3.1.2

Bumps [convert](https://github.com/dart-lang/core/tree/main/pkgs) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/dart-lang/core/releases)
- [Commits](https://github.com/dart-lang/core/commits/convert-v3.1.2/pkgs)

---
updated-dependencies:
- dependency-name: convert
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pubspec.lock

@@ -61,10 +61,10 @@ packages:
     dependency: "direct main"
     description:
       name: convert
-      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
       url: "https://pub.dev"
     source: hosted
-    version: "3.1.1"
+    version: "3.1.2"
   coverage:
     dependency: transitive
     description: