Resolved npm vulnerabilities (#153)

The only way I found for resolving npm audit warnings was by forcing the usage of the latest version of the `gulp-parent` dependency.

For that I've used a new `override` support in Node v8: https://docs.npmjs.com/cli/v8/configuring-npm/package-json#overrides

Here is the output from `npm audit` after the change:
![image](https://user-images.githubusercontent.com/34246760/176778632-0ad02fc3-b392-4b7e-b0e2-092ac3b6560b.png)

I've also updated the license header of the jquery-validation-unobtrusive.js file so that it is aligned with our current (MIT) license as well as is written in JSDoc style, as that's what the new gulp-uglify dependency requires. Otherwise, the license comments will be stripped out from the generated `.min.js` file.

Keeping this as `draft` for now to validate the fix before actually proceeding with merging, given that I've updated the dependencies to their latest versions.

** Validation **
Did some basic validation and it works:
<img width="617" alt="image" src="https://user-images.githubusercontent.com/34246760/176960882-76a24951-c619-45c8-ba91-8b7c8ca32b87.png">

gulpfile.js

@@ -10,10 +10,13 @@ function minifyjs() {
         .pipe(replace(/@version.*/, '@version v' + pkg.version))
         .pipe(gulp.dest("dist"))
         .pipe(uglify({
-            preserveComments: 'license'
+            mangle: true,
+            output: {
+                comments: "some"
+            }
         }))
-        .pipe(lec({eolc: 'CRLF'}))
-        .pipe(rename({suffix: '.min'}))
+        .pipe(lec({ eolc: 'CRLF' }))
+        .pipe(rename({ suffix: '.min' }))
         .pipe(gulp.dest("dist"));
 }