Write changelog for 9.0.0-alpha.20 [skip ci]

Author: storybook-bot

CHANGELOG.prerelease.md

@@ -1,3 +1,9 @@
+## 9.0.0-alpha.20
+
+- Addon Docs: Update telejson - [#31115](https://github.com/storybookjs/storybook/pull/31115), thanks @valentinpalkovic!
+- Migration: Improve glob question text - [#31118](https://github.com/storybookjs/storybook/pull/31118), thanks @ndelangen!
+- Save from Controls: Replace rendererPackage with frameworkPackage - [#31114](https://github.com/storybookjs/storybook/pull/31114), thanks @valentinpalkovic!
+
 ## 9.0.0-alpha.19
 
 - CLI: Fix framework for preview imports - [#31101](https://github.com/storybookjs/storybook/pull/31101), thanks @valentinpalkovic!

code/package.json

@@ -275,5 +275,6 @@
         "Dependency Upgrades"
       ]
     ]
-  }
+  },
+  "deferredNextVersion": "9.0.0-alpha.20"
 }

docs/versions/next.json

@@ -1 +1 @@
-{"version":"9.0.0-alpha.19","info":{"plain":"- CLI: Fix framework for preview imports - [#31101](https://github.com/storybookjs/storybook/pull/31101), thanks @valentinpalkovic!\n- Controls: Fix boxShadow on empty controls - [#27193](https://github.com/storybookjs/storybook/pull/27193), thanks @H0onnn!\n- Core: Fix favicon issue on dev server - [#30818](https://github.com/storybookjs/storybook/pull/30818), thanks @MuhdHishamP!\n- UI: Clear filters on run all and clear all statuses - [#31073](https://github.com/storybookjs/storybook/pull/31073), thanks @JReinhold!\n- UI: Don't include error state in sidebar context menu - [#31054](https://github.com/storybookjs/storybook/pull/31054), thanks @ghengeveld!"}}
+{"version":"9.0.0-alpha.20","info":{"plain":"- Addon Docs: Update telejson - [#31115](https://github.com/storybookjs/storybook/pull/31115), thanks @valentinpalkovic!\n- Migration: Improve glob question text - [#31118](https://github.com/storybookjs/storybook/pull/31118), thanks @ndelangen!\n- Save from Controls: Replace rendererPackage with frameworkPackage - [#31114](https://github.com/storybookjs/storybook/pull/31114), thanks @valentinpalkovic!"}}