build(deps): bump watcher from 1.2.0 to 1.2.1 (#187)

Bumps [watcher](https://github.com/dart-lang/tools/tree/main/pkgs) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/dart-lang/tools/releases)
- [Commits](https://github.com/dart-lang/tools/commits/watcher-v1.2.1/pkgs)

---
updated-dependencies:
- dependency-name: watcher
  dependency-version: 1.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pubspec.lock

@@ -1564,10 +1564,10 @@ packages:
     dependency: "direct main"
     description:
       name: watcher
-      sha256: f52385d4f73589977c80797e60fe51014f7f2b957b5e9a62c3f6ada439889249
+      sha256: "1398c9f081a753f9226febe8900fce8f7d0a67163334e1c94a2438339d79d635"
       url: "https://pub.dev"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   web:
     dependency: transitive
     description: