docs: Switch over migration guide from v8 to v9

[lforst]

Resolves #14289

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.9 KB	-	-
@sentry/browser - with treeshaking flags	22.77 KB	-	-
@sentry/browser (incl. Tracing)	35.77 KB	-	-
@sentry/browser (incl. Tracing, Replay)	72.58 KB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	66.13 KB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	76.82 KB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	89.56 KB	-	-
@sentry/browser (incl. Feedback)	39.84 KB	-	-
@sentry/browser (incl. sendFeedback)	27.53 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.31 KB	-	-
@sentry/react	24.73 KB	-	-
@sentry/react (incl. Tracing)	37.67 KB	-	-
@sentry/vue	27.09 KB	-	-
@sentry/vue (incl. Tracing)	37.47 KB	-	-
@sentry/svelte	22.94 KB	-	-
CDN Bundle	24.2 KB	-	-
CDN Bundle (incl. Tracing)	35.92 KB	-	-
CDN Bundle (incl. Tracing, Replay)	70.56 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	75.7 KB	-	-
CDN Bundle - uncompressed	70.76 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	106.64 KB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	217.49 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	230.06 KB	-	-
@sentry/nextjs (client)	38.63 KB	-	-
@sentry/sveltekit (client)	36.2 KB	-	-
@sentry/node	156.51 KB	-	-
@sentry/node - without tracing	97.52 KB	-	-
@sentry/aws-serverless	107 KB	-	-

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