Update dependency lodash to v4.17.21

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
lodash (source)	dependencies	patch	4.17.19 -> 4.17.21

By merging this PR, the issue #57 will be automatically resolved and closed:

Severity	CVSS Score	CVE
High	7.2	CVE-2021-23337
Medium	5.3	CVE-2020-28500

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Release Notes

lodash/lodash

### [`v4.17.21`](https://togithub.com/lodash/lodash/compare/4.17.20...4.17.21) [Compare Source](https://togithub.com/lodash/lodash/compare/4.17.20...4.17.21) ### [`v4.17.20`](https://togithub.com/lodash/lodash/compare/4.17.19...4.17.20) [Compare Source](https://togithub.com/lodash/lodash/compare/4.17.19...4.17.20)

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