ci: Fix size limit comparison

[mydea]

I inlined https://github.com/billyvg/github-fetch-workflow-artifact, basically, as it struggled to import this in esm, for whatever reason... now all the code is inlined, which is fine I guess 😬

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback)	80.55 KB (0%)
@sentry/browser (incl. Tracing, Replay)	71.89 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas)	75.7 KB (0%)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	65.44 KB (0%)
@sentry/browser (incl. Tracing)	36.71 KB (0%)
@sentry/browser (incl. browserTracingIntegration)	36.71 KB (0%)
@sentry/browser (incl. feedbackIntegration)	31.35 KB (0%)
@sentry/browser (incl. feedbackModalIntegration)	31.46 KB (0%)
@sentry/browser (incl. feedbackScreenshotIntegration)	31.47 KB (0%)
@sentry/browser (incl. sendFeedback)	27.42 KB (0%)
@sentry/browser	22.58 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback)	74.9 KB (0%)
CDN Bundle (incl. Tracing, Replay)	69.73 KB (0%)
CDN Bundle (incl. Tracing)	36.3 KB (0%)
CDN Bundle	23.94 KB (0%)
CDN Bundle (incl. Tracing, Replay) - uncompressed	219.01 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	109.57 KB (0%)
CDN Bundle - uncompressed	70.92 KB (0%)
@sentry/react (incl. Tracing, Replay)	71.87 KB (0%)
@sentry/react	22.61 KB (0%)