Limit Chokidar's lower bound to 3.0.0 (#1279)

There's no reason we *should* have to do this, since we do declare
support for Chokidar 3.0.0 and npm *should* just install the latest
available version that matches the constraint. But in practice it
doesn't for some reason, so I guess we'll narrow the constraint to
work around that.

See #863

Author: nex3

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 * Fix a typo in a deprecation warning.
 
+### JavaScript API
+
+* Drop support for Chokidar 2.x. This version was incompatible with Node 14, but
+  due to shortcomings in npm's version resolver sometimes still ended up
+  installed anyway. Only declaring support for 3.0.0 should ensure compatibility
+  going forward.
+
 ### Dart API
 
 * Allow the null safety release of args and watcher.

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass
-version: 1.32.9-dev
+version: 1.32.9
 description: A Sass implementation in Dart.
 author: Sass Team
 homepage: https://github.com/sass/dart-sass