chore: correct regex pattern for eslint-plugin/report-message-format (#581)

Author: lumirlumir

eslint.config.js

@@ -98,7 +98,7 @@ export default defineConfig([
 			"eslint-plugin/require-meta-schema": "off", // `schema` defaults to []
 			"eslint-plugin/prefer-placeholders": "error",
 			"eslint-plugin/prefer-replace-text": "error",
-			"eslint-plugin/report-message-format": ["error", "[^a-z].*\\.$"],
+			"eslint-plugin/report-message-format": ["error", "^[^a-z].*\\.$"],
 			"eslint-plugin/require-meta-docs-description": [
 				"error",
 				{ pattern: "^(Enforce|Require|Disallow) .+[^. ]$" },