chore(deps): update Cocoa SDK to v7.21.0

[github-actions]

Bumps flutter/scripts/update-cocoa.sh from 7.19.0 to 7.21.0.

Auto-generated by a dependency updater.

Changelog

7.21.0

Features

• Enhance the UIViewController breadcrumbs with more data (#1945)
• feat: Add extra app start span (#1952)
• Add enableAutoBreadcrumbTracking option (#1958)
• Automatic nest spans with the UI life cycle (#1959)
• Upload frame rendering timestamps to correlate to sampled backtraces (#1910)

Fixes

• Don't track OOMs for simulators (#1970)
• Properly sanitize the event context and SDK information (#1943)
• Don't send error 429 as network_error (#1957)
• Sanitize Span data (#1963)
• Deprecate not needed option sdkInfo (#1960)
• Crash in profiling logger (#1964)

7.20.0

Features

• Add screenshot at crash (#1920)
• Track timezone changes as breadcrumbs (#1930)
• Add sample rate in the baggage header, remove Userid and Transaction (#1936)

[codecov-commenter]

Codecov Report

Merging #947 (b3cd379) into main (46626ac) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #947   +/-   ##
=======================================
  Coverage   89.94%   89.94%           
=======================================
  Files           9        9           
  Lines         169      169           
=======================================
  Hits          152      152           
  Misses         17       17           

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