chore: update flutter/scripts/update-cocoa.sh to 7.21.0 (#947)

Co-authored-by: GitHub <[email protected]>

Author: github-actions[bot]

CHANGELOG.md

@@ -12,6 +12,9 @@
 - Bump Android SDK to v6.2.1 ([#945](https://github.com/getsentry/sentry-dart/pull/945))
   - [changelog](https://github.com/getsentry/sentry-java/blob/main/CHANGELOG.md#621)
   - [diff](https://github.com/getsentry/sentry-java/compare/6.1.4...6.2.1)
+- Bump Cocoa SDK to v7.21.0 ([#947](https://github.com/getsentry/sentry-dart/pull/947))
+  - [changelog](https://github.com/getsentry/sentry-cocoa/blob/master/CHANGELOG.md#7210)
+  - [diff](https://github.com/getsentry/sentry-cocoa/compare/7.19.0...7.21.0)
 
 ## 6.6.3
 

flutter/ios/sentry_flutter.podspec

@@ -12,7 +12,7 @@ Sentry SDK for Flutter with support to native through sentry-cocoa.
                          :tag => s.version.to_s }
   s.source_files     = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
-  s.dependency 'Sentry', '~> 7.19.0'
+  s.dependency 'Sentry', '~> 7.21.0'
   s.ios.dependency 'Flutter'
   s.osx.dependency 'FlutterMacOS'
   s.ios.deployment_target = '9.0'