fix(deps): update dependency node-forge to v0.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
node-forge	dependencies	patch	0.8.0 -> 0.8.1	source

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Release Notes

digitalbazaar/forge

### [`v0.8.1`](https://togithub.com/digitalbazaar/forge/blob/master/CHANGELOG.md#​081---2019-02-23) [Compare Source](https://togithub.com/digitalbazaar/forge/compare/0.8.0...0.8.1) ##### Fixed - Fix off-by-1 bug with kem random generation.

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