Update CHANGELOG.md for v9.1.5 [skip ci]

Author: storybook-bot

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 9.1.5
+
+- CSF: Support `satisfies x as y` syntax - [#32169](https://github.com/storybookjs/storybook/pull/32169), thanks @diagramatics!
+- Vitest addon: Handle Playwright installation errors gracefully - [#32329](https://github.com/storybookjs/storybook/pull/32329), thanks @ndelangen!
+
 ## 9.1.4
 
 - Angular: Properly merge builder options and browserTarget options - [#32272](https://github.com/storybookjs/storybook/pull/32272), thanks @kroeder!