fix: pass validator config options when validating OpenAPI doc

[reversearrow]

Currently, when initializing validator.NewValidator with a custom regex engine, that engine is not passed down to the ValidateDocument() function.

For example:

validator, errs := validator.NewValidator(doc, config.WithRegexEngine(customRegexEngine))
if len(errs) > 0 {
	log.Fatal(errs)
	return 
}
docValid, valErrors := validator.ValidateDocument()
if len(valErrors) > 0 {
	log.Fatal(valErrors)
	return
}

In this case, although config.WithRegexEngine(customRegexEngine) is provided during initialization, it is not used during validation, because ValidateDocument() does not forward the option.

This PR resolves the issue by ensuring v.options.RegexEngine is passed into ValidateOpenAPIDocument using the config.WithRegexEngine option. This ensures that any custom regex engine specified during initialization is correctly applied when validating OpenAPI documents.

[reversearrow]

@daveshanley Can you provide some feedback on this PR?

[daveshanley]

This is good, thank you for finding this gap!

[codecov]

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[daveshanley]

LGTM, resolve the conflict with the go.mod (I just merged in some dependabot PRs). Thank you for your contribution!

[reversearrow]

@daveshanley updated. Thank you!