fix: allow 2-letter topics in pubspec.yaml (SchemaStore#5288)

Author: adil192

src/schemas/json/pubspec.json

@@ -305,7 +305,7 @@
       "maxItems": 5,
       "items": {
         "type": "string",
-        "pattern": "^[a-z][a-z0-9-]{1,30}[a-z0-9]$"
+        "pattern": "^[a-z][a-z0-9-]{0,30}[a-z0-9]$"
       },
       "examples": [
         ["network", "http"],

src/test/pubspec/pubspec.yaml

@@ -6,6 +6,7 @@ repository: https://example.com/repo.git
 version: 0.3.1-foobar.2.0
 publish_to: 'none'
 topics:
+  - ui
   - yaml
 
 environment: