JavaScript: Add support for \d flag from ES2022.

Author: MathiasVP

javascript/extractor/src/com/semmle/jcorn/Parser.java

@@ -790,7 +790,8 @@ private Token readRegexp() {
       String validFlags = "gim";
       if (this.options.ecmaVersion() >= 6) validFlags = "gimuy";
       if (this.options.ecmaVersion() >= 9) validFlags = "gimsuy";
-      if (this.options.ecmaVersion() >= 15) validFlags = "gimsuyv";
+      if (this.options.ecmaVersion() >= 13) validFlags = "dgimsuy";
+      if (this.options.ecmaVersion() >= 15) validFlags = "dgimsuyv";
       if (!mods.matches("^[" + validFlags + "]*$"))
         this.raise(start, "Invalid regular expression flag");
       if (mods.indexOf('u') >= 0) {