fix(deps): update storybook monorepo to v7.6.20

Author: renovate[bot]

packages/cli-packages/storybook-vite/package.json

@@ -25,7 +25,7 @@
     "@redwoodjs/telemetry": "workspace:*",
     "chalk": "4.1.2",
     "execa": "5.1.1",
-    "storybook": "7.6.17",
+    "storybook": "7.6.20",
     "storybook-framework-redwoodjs-vite": "workspace:*",
     "terminal-link": "2.1.1",
     "yargs": "17.7.2"

packages/storybook/package.json

@@ -51,9 +51,9 @@
     "@joshwooding/vite-plugin-react-docgen-typescript": "0.3.1",
     "@redwoodjs/testing": "workspace:*",
     "@rollup/pluginutils": "5.1.0",
-    "@storybook/addon-essentials": "7.6.17",
-    "@storybook/builder-vite": "7.6.17",
-    "@storybook/react": "7.6.17",
+    "@storybook/addon-essentials": "7.6.20",
+    "@storybook/builder-vite": "7.6.20",
+    "@storybook/react": "7.6.20",
     "magic-string": "0.30.10",
     "react-docgen": "7.0.3",
     "unplugin-auto-import": "0.18.0"
@@ -69,7 +69,7 @@
     "@redwoodjs/router": "workspace:*",
     "react": "19.0.0-beta-04b058868c-20240508",
     "react-dom": "19.0.0-beta-04b058868c-20240508",
-    "storybook": "7.6.17"
+    "storybook": "7.6.20"
   },
   "engines": {
     "node": "=20.x"