Bump version from "8.4.2" to "8.4.3" [skip ci]

Author: storybook-bot

code/addons/a11y/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@storybook/addon-a11y",
-  "version": "8.4.2",
+  "version": "8.4.3",
   "description": "Test component compliance with web accessibility standards",
   "keywords": [
     "a11y",

code/addons/actions/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@storybook/addon-actions",
-  "version": "8.4.2",
+  "version": "8.4.3",
   "description": "Get UI feedback when an action is performed on an interactive element",
   "keywords": [
     "storybook",