Use URI methods to validate URLs instead of patterns

[gael-ian]

Since uri 1.0.0 (released last November), the defaut parser for the URI module switched to RFC3986_Parser (Changelog, PR) and RegExp patterns referenced in Dhalang's UrlUtils are missing.

This is a proposition to use URI methods to validate given URL is an absolute URL. As the programming interface of the URI module has been mostly stable for very long time now, this method should be more resilient to future code changes.

[gael-ian]

@NielsSteensma Updates on Gemfile.lock should also fix your publish action on Github Actions so you can release new versions of Dhalang again :)

[NielsSteensma]

@NielsSteensma Updates on Gemfile.lock should also fix your publish action on Github Actions so you can release new versions of Dhalang again :)

Yes, sorry for that.

Highly appreciate the contributions!