chore(release): 1.21.0-dev.4 [skip ci]

# [1.21.0-dev.4](v1.21.0-dev.3...v1.21.0-dev.4) (2024-06-24)

### Bug Fixes

* Cache external API calls  ([#1911](#1911)) ([2c3e2e6](2c3e2e6))
* Follow language update immediately ([#1944](#1944)) ([c13827e](c13827e))
* SecurityException when patching application ([#1856](#1856)) ([e0a6de2](e0a6de2))
* Update dialog shows dev version & loading gets stuck in certain circumstances ([#1792](#1792)) ([fc52560](fc52560))

### Features

* Add ability to set `null` in patch options ([#1947](#1947)) ([5c68d51](5c68d51))

pubspec.yaml

@@ -4,7 +4,7 @@ homepage: https://github.com/ReVanced/revanced-manager
 
 publish_to: 'none'
 
-version: 1.21.0-dev.3+101800019
+version: 1.21.0-dev.4+101800020
 
 environment:
   sdk: '>=3.0.0 <4.0.0'