Fix image path for graphiql UI screenshot

[andrew-demb]

With #2687 image extension was changed from .jpg to .png, but the readme link was not updated according to the new file extension

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[linux-foundation-easycla]

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• ✅ login: andrew-demb / name: Andrii Dembitskyi (474df42)

[thomasheyenbrock]

Thanks a lot for catching that and opening a PR 🙌 in fact I just merged that same fix that came in an hour earlier in #2703, so I'm closing this.