sentry-native 0.12.4

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

• resource blocks have been checked for updates.

release notes

**Fixes**:

Crashpad: namespace mpack to avoid ODR violation. (#1476, crashpad#143)
Structured logs: stop local attributes overwriting all globally set attributes. They now get merged, and local values overwrite existing global values for the same key. (#1486)

View the full release notes at https://github.com/getsentry/sentry-native/releases/tag/0.12.4.

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