can't personal sign with v2, because the rpc request parameters has a ```nil``` & the index is not last

[JustLee-me]

Describe the bug can't personal sign with v2, because the rpc request parameters has a nil, and AnyCodable will throw the error

1. I have 4 parameters
2. AnyCodable will throw when the 3rd parameter decode
3. I need the 4th parameter to sign

https://github.com/WalletConnect/WalletConnectSwiftV2/blob/9e4e61095ee028d4d329803d6206380dc5f77d74/Sources/Commons/AnyCodable.swift#L160

SDK Version

• Client: WalletConnectSwiftV2
• Version 1.6.11

To Reproduce Steps to reproduce the behavior:

1. open https://app.rhino.fi/portfolio
2. Click on 'Connect Wallet'
3. Click on 'Wallet Connect'
4. use WalletConnectSwiftV2 scan the qr code

Expected behavior person sign success

Screenshots

Device (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.

[flypaper0]

@JustLee-me sorry for long response, could you please check does issue still reproducing?