chore(deps): update @sentry/browser to v5.12.5

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
@sentry/browser	patch	devDependencies	5.12.1 -> 5.12.5

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Release Notes

getsentry/sentry-javascript

### [`v5.12.5`](https://togithub.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md#​5125) [Compare Source](https://togithub.com/getsentry/sentry-javascript/compare/5.12.4...5.12.5) - [browser] ref: Mark transactions as event.transaction in breadcrumbs ([#​2450](https://togithub.com/getsentry/sentry-javascript/issues/2450)) - [node] fix: Dont overwrite servername in requestHandler ([#​2449](https://togithub.com/getsentry/sentry-javascript/issues/2449)) - [utils] ref: Move creation of iframe into try/catch in fetch support check ([#​2447](https://togithub.com/getsentry/sentry-javascript/issues/2447)) ### [`v5.12.4`](https://togithub.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md#​5124) [Compare Source](https://togithub.com/getsentry/sentry-javascript/compare/5.12.1...5.12.4) - [browser] ref: Rework XHR wrapping logic to make sure it always triggers ([#​2438](https://togithub.com/getsentry/sentry-javascript/issues/2438)) - [browser] fix: Handle PromiseRejectionEvent-like CustomEvents ([#​2429](https://togithub.com/getsentry/sentry-javascript/issues/2429)) - [core] ref: Notify user when event failed to deliver because of digestion pipeline issue ([#​2416](https://togithub.com/getsentry/sentry-javascript/issues/2416)) - [node] fix: Improve incorrect `ParseRequest` typing ([#​2433](https://togithub.com/getsentry/sentry-javascript/issues/2433)) - [apm] fix: Remove auto unknown_error transaction status ([#​2440](https://togithub.com/getsentry/sentry-javascript/issues/2440)) - [apm] fix: Properly remove undefined keys from apm payload ([#​2414](https://togithub.com/getsentry/sentry-javascript/issues/2414))

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