add verbatimModuleSyntax to strictest

verbatimModuleSyntax was implemented in TS 5.0 but was never added
to this base config.

(Its predecessor, importsNotUsedAsValues: "error", was added in TS 3.8,
and was also never added here.)

Author: dynst

bases/strictest.json

@@ -13,6 +13,7 @@
     "noUnusedParameters": true,
 
     "isolatedModules": true,
+    "verbatimModuleSyntax": true,
 
     "checkJs": true,