Update Erigon contributions with Zilkworm link

Added link to Zilkworm repository under Erigon contributions. 

`erigontech/zilkworm` is best represented here as part of the broader Erigon project surface, rather than as a request for a separate project.

Zilkworm is now a priority for Ethereum's and Erigon's roadmap for the year. This new repository is being actively maintained and will be contributed to heavily for the zkEVM objectives on L1

While Zilkworm does share and borrow some code lineage from Silkworm, it's radically different in its code structure and usage.

Author: somnergy

docs/01-membership.md

@@ -162,7 +162,7 @@ Individuals from active working groups produce the membership by opting into Pro
 
 | **EXECUTION CLIENTS** | Weight | Contributions |
 |:---|:---|:---|
-| **Erigon** (16 contributors) | | [erigontech/erigon](https://github.com/erigontech/erigon) |
+| **Erigon** (16 contributors) | | [erigontech/erigon](https://github.com/erigontech/erigon), [erigontech/zilkworm](https://github.com/erigontech/zilkworm) |
 | [Alexey Sharov](https://github.com/AskAlexSharov/) | 1 | |
 | [Andrey Ashikhmin](https://github.com/yperbasis/) | 1 | [erigontech/erigon](https://github.com/erigontech/erigon/pulls?q=author%3Ayperbasis), [erigontech/silkworm](https://github.com/erigontech/silkworm/pulls?q=author%3Ayperbasis) |
 | [Artem Tsebrovskii](https://github.com/awskii/) | 1 | |