deps: allow coincurve 21 to fix Python 3.13 source build

[pdobacz]

Greptile Summary

This PR allows the project to use coincurve 21.x. The main changes are:

• Widened the root coincurve dependency range to <22.
• Widened the testing package coincurve dependency range to <22.
• Updated the lockfile to coincurve 21.0.0 and removed its old transitive asn1crypto entry.
• Inlined the secp256k1_recover public-key formatting return.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
pyproject.toml	Widens the main package coincurve dependency range from <21 to <22.
packages/testing/pyproject.toml	Widens the testing package coincurve dependency range from <21 to <22.
src/ethereum/crypto/elliptic_curve.py	Returns the formatted uncompressed public key directly from secp256k1_recover.
uv.lock	Locks coincurve to 21.0.0 and updates dependency metadata.

_{Reviews (1): Last reviewed commit: "deps: allow coincurve 21 to fix Python 3..." | Re-trigger Greptile}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	coincurve@​20.0.0 ⏵ 21.0.0

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