Upgrade dependencies

[ddm]

The version of swagger-ui used by node-red-node-swagger at the moment is affected by 3 vulnerabilities:
https://nodesecurity.io/advisories/123
https://nodesecurity.io/advisories/126
https://nodesecurity.io/advisories/131

$ nsp check --output summary
(+) 3 vulnerabilities found
 Name         Installed   Patched   Path                                             More Info
 swagger-ui   2.1.4       >=2.2.1   [email protected] > [email protected]   https://nodesecurity.io/advisories/126
 swagger-ui   2.1.4       >=2.1.5   [email protected] > [email protected]   https://nodesecurity.io/advisories/123
 swagger-ui   2.1.4       >=2.1.5   [email protected] > [email protected]   https://nodesecurity.io/advisories/131

Upgrading the dependencies fixes the issue.

[jsf-clabot]

All committers have signed the CLA.

[JonSilver]

I've found that upgrading swagger-ui in this way causes errors, and requires further unknown changes to make it work with node-red-node-swagger