Pick up TS 4.4@next for building

- Disables the two new strictness options for now
- Adopt shared tsconfig for `microsoft-authentication `

src/tsconfig.base.json

@@ -8,6 +8,8 @@
 		"noUnusedLocals": true,
 		"allowUnreachableCode": false,
 		"strict": true,
+		"strictOptionalProperties": false,
+		"useUnknownInCatchVariables": false,
 		"forceConsistentCasingInFileNames": true,
 		"baseUrl": ".",
 		"paths": {