build(deps-dev): bump @wordpress/blocks from 15.8.0 to 15.9.0 (#3856)

Author: dependabot[bot]

package-lock.json

@@ -57,7 +57,7 @@
 		"@wordpress/api-fetch": "7.29",
 		"@wordpress/babel-preset-default": "^7.42.0",
 		"@wordpress/block-editor": "^15.6.0",
-		"@wordpress/blocks": "^15.8.0",
+		"@wordpress/blocks": "^15.9.0",
 		"@wordpress/components": "^30.8.0",
 		"@wordpress/compose": "^7.36.0",
 		"@wordpress/core-data": "^7.33.0",