fix: update min TS and NG versions

Angular v11.1 uses TS 4.0, these are the minimum version required for
the next release.

Author: kyliau

server/src/version_provider.ts

@@ -8,8 +8,8 @@
 
 import * as fs from 'fs';
 
-const MIN_TS_VERSION = '3.9';
-const MIN_NG_VERSION = '10.0';
+const MIN_TS_VERSION = '4.0';
+const MIN_NG_VERSION = '11.1';
 
 /**
  * Represents a valid node module that has been successfully resolved.