bump sb to 6.4.0

Author: Abd El-Ghazali

plugins/storybook/package.json

@@ -27,16 +27,16 @@
     "@design-systems/build": "link:../build",
     "@design-systems/cli-utils": "link:../../packages/cli-utils",
     "@design-systems/plugin": "link:../../packages/plugin",
-    "@storybook/addon-a11y": "^6.2.9",
-    "@storybook/addon-actions": "^6.2.9",
-    "@storybook/addon-backgrounds": "^6.2.9",
-    "@storybook/addon-knobs": "^6.2.9",
-    "@storybook/addon-viewport": "^6.2.9",
-    "@storybook/addons": "^6.2.9",
-    "@storybook/cli": "^6.2.9",
-    "@storybook/components": "^6.2.9",
-    "@storybook/react": "^6.2.9",
-    "@storybook/theming": "^6.2.9",
+    "@storybook/addon-a11y": "^6.4.0",
+    "@storybook/addon-actions": "^6.4.0",
+    "@storybook/addon-backgrounds": "^6.4.0",
+    "@storybook/addon-knobs": "^6.4.0",
+    "@storybook/addon-viewport": "^6.4.0",
+    "@storybook/addons": "^6.4.0",
+    "@storybook/cli": "^6.4.0",
+    "@storybook/components": "^6.4.0",
+    "@storybook/react": "^6.4.0",
+    "@storybook/theming": "^6.4.0",
     "babel-loader": "8.1.0",
     "core-js": "3.6.5",
     "dedent": "0.7.0",