Bump to OkHttp 5

[yschimke]

Summary

Use OkHttp5, while alpha it is production quality, but new API are not stable.

But critically it includes support for a simplified form of Happy Eyeballs, avoiding issues on IPv6 networks.

See https://www.reddit.com/r/RedditEng/comments/v1upr8/ipv6_support_on_android/

No offense if this is too soon. Please close the PR if so.

Screenshots

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Link to pull request in Documentation repository

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Any other notes

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[jpelgrom]

Looks like there are new releases on the 5.0 branch again (when the PR was submitted, it had almost been a year since a release), and they put the same note about 'stable except for new APIs' in the docs.

I don't see any reason to not accept this PR if it is rebased/updated/building is fixed.