chore: deps upgrades (including ts 4.1)

src/app.ts

@@ -18,7 +18,7 @@ if (typeof (testSocket.tls as any).exportKeyingMaterial !== 'function') {
 
 const { argv } = yargs
 	.usage('NODE RADIUS Server\nUsage: radius-server')
-	.example('radius-server --port 1812 -s radiussecret')
+	.example('radius-server --port 1812 -s radiussecret', 'start on port 1812 with a secret')
 	.default({
 		port: config.port || 1812,
 		s: config.secret || 'testing123',

src/auth/GoogleLDAPAuth.ts

@@ -62,7 +62,7 @@ export class GoogleLDAPAuth implements IAuthentication {
 	private async fetchDNs() {
 		const dns: { [key: string]: string } = {};
 
-		await new Promise((resolve, reject) => {
+		await new Promise<void>((resolve, reject) => {
 			const ldapDNClient = createClient(this.config).on('error', (error) => {
 				console.error('Error in ldap', error);
 				reject(error);

src/helpers.ts

@@ -38,4 +38,4 @@ export const newDeferredPromise = (): IDeferredPromise => {
 };
 
 export const delay = (timeout: number) =>
-	new Promise((resolve) => setTimeout(() => resolve(), timeout));
+	new Promise<void>((resolve) => setTimeout(() => resolve(), timeout));