Update dependency superagent to v5.1.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
superagent	dependencies	patch	5.1.2 -> 5.1.3

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Release Notes

visionmedia/superagent

### [`v5.1.3`](https://togithub.com/visionmedia/superagent/releases/v5.1.3) [Compare Source](https://togithub.com/visionmedia/superagent/compare/v5.1.2...v5.1.3) - fix: fixed support for NODE_TLS_REJECT_UNAUTHORIZED (per [#​1511](https://togithub.com/visionmedia/superagent/issues/1511)) [`2377e62`](https://togithub.com/visionmedia/superagent/commit/2377e62)

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