updated dependencies

[elthrasher]

The build/test/publish system for this repo is a bit outdated and many dependencies are out of date. It looks like the build and tests still work, but that gulpfile isn't working for me. I think the best bet is to just remove it and replace with npm scripts.

@jotamorais I was very happy to see that you were taking over maintenance of this project. Should I continue with this effort?

[elthrasher]

Amazingly, I barely had to touch any code or tests. We now have 100% updated dependencies and npm audit comes up clean.

[jotamorais]

@elthrasher Thanks for your PR. I don't think there will be any major problems either but I'm testing with a big project I'm currently working on (I think it will be a good "test ground").
I will get back to you shortly.

[elthrasher]

@jotamorais I did some testing too and looks to me like breaking changes in class-transformer and class-validator might be an issue. Probably a good idea to move them to peer dependencies like has already been suggested: #472 and #384.
I can do that here if you'd like.

[jotamorais]

@jotamorais I did some testing too and looks to me like breaking changes in class-transformer and class-validator might be an issue. Probably a good idea to move them to peer dependencies like has already been suggested: #472 and #384.
I can do that here if you'd like.

Yeah, let's do it. Then we can test the whole thing using peer dependencies and make sure it won't have any undesired effect.

[jotamorais]

@elthrasher
I've tested more with the project I mentioned before and everything seems to still work just fine after updating dependencies and moving class-transformer and class-validator to peer dependencies.
Additionally, I've also tested [routing-controllers-openapi](https://github.com/epiphone/routing-controllers-openapi#readme) and it also worked like a charm.

Thanks for your contributions and PR.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.