Encode block_count as hex in eth_feeHistory RPC

[shuklaayush]

What was wrong?

eth_feeHistory RPC call was sending block_count as a raw integer instead of hex. This broke hardhat since it expects QUANTITIES (integers etc.) to be hex-encoded

How was it fixed?

Modified eth_feeHistory formatter to encode block_count as hex before making the RPC call

Todo:

• Add entry to the release notes

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[shuklaayush]

Looks like the CI uses Geth 1.10.6 which doesn't support block count as hex. This was fixed in the 1.10.7 release (relevant PR). I guess we'll have to wait till this py-geth PR gets merged.

[fselmo]

I guess we'll have to wait till this py-geth PR gets merged.

Thanks for this. We'll try to get this py-geth version bump in asap. I'd recommend writing a test for this as well or I can add one here later. [On second thought I think the ones we have will do.]

Also, please note that geth version 1.10.8 is the one to use post-London since it includes a hotfix for a security vulnerability. Any other version post-London is susceptible to this vulnerability. Figured I'd reiterate this here; couldn't hurt.

[fselmo]

@shuklaayush merged! Thanks again for jumping on this before the py-geth PR was even merged.