In the LensHub contract, users can provide signatures to allow relayers to call functions on their behalf in meta-transactions, such as followWithSig().
However, there is currently no way for the user to revoke their signatures. This could become a problem is the user needs to revoke their signatures (eg. action or reference module turns malicious, user doesnt want to use the module anymore).
In the Lenshub contract, implement a way for users to revoke their signatures. One way of achieving this is to add a function that increments the callers nonce:
