meta: Set version to 8.0.0-alpha.0

[mydea]

This is done to ensure all tests still pass when we bump the version, as versions in bundler plugins need to be overwritten for e2e tests etc.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.17 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	68.43 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	72.34 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	61.97 KB (0%)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	32.65 KB (0%)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	32.65 KB (0%)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	30.81 KB (0%)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	30.81 KB (0%)
@sentry/browser - Webpack (gzipped)	22.09 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	75.58 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.26 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.09 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.58 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	210.74 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	99.46 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	73.64 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.16 KB (0%)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	68.71 KB (0%)
@sentry/react - Webpack (gzipped)	22.12 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	85.18 KB (0%)
@sentry/nextjs Client - Webpack (gzipped)	49.52 KB (0%)
@sentry-internal/feedback - Webpack (gzipped)	17.03 KB (0%)