add note on docs

Author: chargome

docs/migration/draft-v9-migration-guide.md

@@ -90,3 +90,7 @@
 - Deprecated `processThreadBreadcrumbIntegration` in favor of `childProcessIntegration`. Functionally they are the same.
 - Deprecated `nestIntegration`. Use the NestJS SDK (`@sentry/nestjs`) instead.
 - Deprecated `setupNestErrorHandler`. Use the NestJS SDK (`@sentry/nestjs`) instead.
+
+## `@sentry/astro`
+
+- Deprecated passing `dsn`, `release`, `environment`, `sampleRate`, `tracesSampleRate`, `replaysSessionSampleRate` to the integration. Use the runtime-specific `Sentry.init()` calls for passing these options instead.