Group regexp related dependencies in renovate.json5 (#17223)

.github/renovate.json5

@@ -49,6 +49,10 @@
       groupName: "Angular Estree",
       matchPackageNames: ["@angular/compiler", "angular-estree-parser"],
     },
+    {
+      groupName: "Regex related",
+      matchPackageNames: ["regexp-util", "unicode-regex", "cjk-regex"],
+    },
     {
       branchPrefix: "renovate/website/",
       matchFileNames: ["website/package.json"],