debugger: avoid non-ASCII char in code file

Avoid non-ASCII char in lib code as a single non-ASCII char forces all
the chars to be stored inefficiently, bloating the binary size. This
also brings the file closer to compatibility with our lint rules.

PR-URL: nodejs#38529
Backport-PR-URL: nodejs#39446
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/inspector/inspect_repl.js

@@ -353,7 +353,10 @@ function createRepl(inspector) {
 
     [util.inspect.custom](depth, { stylize }) {
       const { startTime, endTime } = this.data;
-      return stylize(`[Profile ${endTime - startTime}μs]`, 'special');
+      return stylize(
+        `[Profile ${endTime - startTime}${String.fromCharCode(956)}s]`,
+        'special'
+      );
     }
 
     save(filename = 'node.cpuprofile') {