fix(@angular-devkit/build-optimizer): revert to using TS 3.6

Workaround for microsoft/TypeScript#36098.

Should go back to 3.7 once it is fixed.

Author: filipesilva

packages/angular_devkit/build_optimizer/package.json

@@ -12,7 +12,7 @@
     "loader-utils": "1.2.3",
     "source-map": "0.7.3",
     "tslib": "1.10.0",
-    "typescript": "3.7.4",
+    "typescript": "3.6.4",
     "webpack-sources": "1.4.3"
   }
 }

yarn.lock

@@ -10893,6 +10893,11 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
+[email protected]:
+  version "3.6.4"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.6.4.tgz#b18752bb3792bc1a0281335f7f6ebf1bbfc5b91d"
+  integrity sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==
+
 [email protected]:
   version "3.7.4"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.7.4.tgz#1743a5ec5fef6a1fa9f3e4708e33c81c73876c19"