build(deps): bump ffigen from 20.0.0 to 20.1.0 (#152)

Bumps [ffigen](https://github.com/dart-lang/native/tree/main/pkgs) from 20.0.0 to 20.1.0.
- [Release notes](https://github.com/dart-lang/native/releases)
- [Commits](https://github.com/dart-lang/native/commits/ffigen-v20.1.0/pkgs)

---
updated-dependencies:
- dependency-name: ffigen
  dependency-version: 20.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pubspec.lock

@@ -398,10 +398,10 @@ packages:
     dependency: "direct dev"
     description:
       name: ffigen
-      sha256: c880c7cda18808b10304ecbd3e3867b29a8da0d58fd2d03080829e3b65bc567c
+      sha256: "5c792e87491e762b64c225c295563534e37df68b4d4ccbf2f6b928d264285a73"
       url: "https://pub.dev"
     source: hosted
-    version: "20.0.0"
+    version: "20.1.0"
   file:
     dependency: "direct main"
     description: