fix(tests): Make CLS web vital test less flaky

[lobsterkatie]

Despite the fact that we're using a toBeCloseTo() check rather than a toEqual() check on the integration test for recording a "poor" CLS web vital, that test seems to have a habit of failing in CI, by ending up being not quite close enough to the desired value.

This fixes that by widening the window of tolerance just slightly, hopefully enough to prevent the flakiness.

[github-actions]

size-limit report

Path	Base Size (0b4fd16)	Current Size	Change
@sentry/browser - CDN Bundle (gzipped)	19.68 KB	19.68 KB	+0.01% 🔺
@sentry/browser - CDN Bundle (minified)	62.89 KB	62.9 KB	+0.01% 🔺
@sentry/browser - Webpack	22.21 KB	22.21 KB	0%
@sentry/browser - Webpack - gzip = false	76.02 KB	76.02 KB	0%
@sentry/react - Webpack	22.24 KB	22.24 KB	0%
@sentry/nextjs Client - Webpack	46.24 KB	46.24 KB	0%
@sentry/browser + @sentry/tracing - CDN Bundle (gzipped)	28.22 KB	28.23 KB	+0.02% 🔺