Update ansi-color.js

Fix for `Legacy octal escape is not permitted in strict mode`

Reference : open-telemetry/opentelemetry-js#3759 (comment)

lib/ansi-color.js

@@ -27,14 +27,14 @@ var ANSI_CODES = {
   "white_bg": 47
 };
 
-function setColor(str,color) {
-  if(!color) return str;
+function setColor(str, color) {
+  if (!color) return str;
   var color_attrs = color.split("+");
   var ansi_str = "";
-  for(var i=0, attr; attr = color_attrs[i]; i++) {
-    ansi_str += "\033[" + ANSI_CODES[attr] + "m";
+  for (var i = 0, attr; attr = color_attrs[i]; i++) {
+    ansi_str += "\x1b[" + ANSI_CODES[attr] + "m"; // \x1b is the hexadecimal representation for ESC (0o33 or \033 in octal)
   }
-  ansi_str += str + "\033[" + ANSI_CODES["off"] + "m";
+  ansi_str += str + "\x1b[" + ANSI_CODES["off"] + "m";
   return ansi_str;
 }
 
@@ -59,4 +59,4 @@ if (typeof exports !== "undefined") {
 } else if (typeof define !== "undefined") {
   define([], function() { return { set: setColor, log: logMessage };  });
 }
-}());
+}());