Fix lint

Author: schaable

Diff for: v-next/hardhat/src/internal/cli/error-handler.ts

@@ -81,6 +81,9 @@ export function printErrorMessages(
   print("");
 
   if (showStackTraces) {
+    /* eslint-disable-next-line @typescript-eslint/restrict-template-expressions
+    -- As we don't know the type of error we are printing, we can't know if it
+    has a `stack` property or not, so we print it as a string. */
     print(error instanceof Error ? `${error.stack}` : `${error}`);
     if (postErrorStackTraceMessage !== undefined) {
       print("");