Update CHANGELOG.md for v8.1.6 [skip ci]

CHANGELOG.md

@@ -1,3 +1,10 @@
+## 8.1.6
+
+- CLI: Only log the UpgradeStorybookToSameVersionError but continue the upgrade as normal - [#27217](https://github.com/storybookjs/storybook/pull/27217), thanks @kasperpeulen!
+- Core: Replace ip function with a small helper function to address security concerns - [#27529](https://github.com/storybookjs/storybook/pull/27529), thanks @tony19!
+- Tags: Fix unsafe project-level tags lookup - [#27511](https://github.com/storybookjs/storybook/pull/27511), thanks @shilman!
+- Vite: Fix stats-plugin to normalize file names with posix paths - [#27218](https://github.com/storybookjs/storybook/pull/27218), thanks @AlexAtVista!
+
 ## 8.1.5
 
 - CSF-Tools: Fix export specifier bug - [#27418](https://github.com/storybookjs/storybook/pull/27418), thanks @valentinpalkovic!