fix paymasterstubdata wrong name (#189)

Author: SahilAujla

build/api-specs/alchemy/json-rpc/gas-manager-coverage.json

@@ -626,7 +626,7 @@
             paymaster: "0xfeed"
             paymasterData: "0x789abc"
 
-- name: "pm_getPaymasterDataStub"
+- name: "pm_getPaymasterStubData"
   description: "Returns stub values to be used in paymaster-related fields of an unsigned user operation for gas estimation. Accepts an unsigned user operation, an entrypoint address, a chain ID, and a context object."
   params:
     - name: "userOperation"