dependencies: Upgrade linters and fix linter errors.

The changes here are mostly straightforward; the one exception is
removing a zulipdev.org hack.

We disable some lint rules we'll want to address later (E.g. we want
to switch to using async/await rather than .then()).  But those are
out of scope for this commit.

app/renderer/js/pages/preference/new-server-form.ts

@@ -92,9 +92,7 @@ class NewServerForm extends BaseComponent {
 			this.submitFormHandler();
 		});
 		this.$newServerUrl.addEventListener('keypress', event => {
-			const EnterkeyCode = event.keyCode;
-			// Submit form when Enter key is pressed
-			if (EnterkeyCode === 13) {
+			if (event.key === 'Enter') {
 				this.submitFormHandler();
 			}
 		});