Go back to using SignerWithAddress type

As `SignerWithAddress` is still available - let's use it instead of ethers' `Signer` type

src/account.ts

@@ -2,6 +2,7 @@ import "@nomicfoundation/hardhat-ethers"
 
 import { parseUnits, parseEther, Signer } from "ethers"
 import type { HardhatRuntimeEnvironment } from "hardhat/types"
+import { SignerWithAddress } from "@nomicfoundation/hardhat-ethers/signers";
 
 export type FundOptions = {
   from: Signer
@@ -13,7 +14,7 @@ export interface HardhatAccountHelpers {
   impersonateAccount(
     accountAddress: string,
     fundOptions?: FundOptions
-  ): Promise<Signer>
+  ): Promise<SignerWithAddress>
 }
 
 async function impersonateAccount(

src/signers.ts

@@ -1,19 +1,19 @@
-import { Signer } from "ethers"
+import { SignerWithAddress } from "@nomicfoundation/hardhat-ethers/signers"
 import type { HardhatRuntimeEnvironment } from "hardhat/types"
 
 type NamedSigners = {
-  [name: string]: Signer
+  [name: string]: SignerWithAddress
 }
 
 export interface HardhatSignersHelpers {
   getNamedSigners(): Promise<NamedSigners>
-  getUnnamedSigners(): Promise<Signer[]>
+  getUnnamedSigners(): Promise<SignerWithAddress[]>
 }
 
 async function getNamedSigners(
   hre: HardhatRuntimeEnvironment
 ): Promise<NamedSigners> {
-  const namedSigners: { [name: string]: Signer } = {}
+  const namedSigners: { [name: string]: SignerWithAddress } = {}
 
   await Promise.all(
     Object.entries(await hre.getNamedAccounts()).map(
@@ -28,8 +28,8 @@ async function getNamedSigners(
 
 async function getUnnamedSigners(
   hre: HardhatRuntimeEnvironment
-): Promise<Signer[]> {
-  const unnamedSigners: Signer[] = []
+): Promise<SignerWithAddress[]> {
+  const unnamedSigners: SignerWithAddress[] = []
 
   await Promise.all(
     (