chore(deps): update @sentry/browser to v5.13.0

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
@sentry/browser	minor	devDependencies	5.12.5 -> 5.13.0

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Release Notes

getsentry/sentry-javascript

### [`v5.13.0`](https://togithub.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md#​5130) [Compare Source](https://togithub.com/getsentry/sentry-javascript/compare/5.12.5...5.13.0) - [apm] feat: Add `options.autoPopAfter` parameter to `pushActivity` to prevent never-ending spans ([#​2459](https://togithub.com/getsentry/sentry-javascript/issues/2459)) - [apm] fix: Use monotonic clock to compute durations ([#​2441](https://togithub.com/getsentry/sentry-javascript/issues/2441)) - [core] ref: Remove unused `sentry_timestamp` header ([#​2458](https://togithub.com/getsentry/sentry-javascript/issues/2458)) - [node] ref: Drop Node v6, add Node v12 to test matrix, move all scripts to Node v12 ([#​2455](https://togithub.com/getsentry/sentry-javascript/issues/2455)) - [utils] ref: Prevent instantiating unnecessary Date objects in `timestampWithMs` ([#​2442](https://togithub.com/getsentry/sentry-javascript/issues/2442)) - [browser] fix: Mark transactions as event.transaction in breadcrumbs correctly

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