Update module github.com/urfave/cli/v2 to v2.20.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/urfave/cli/v2	require	patch	v2.20.2 -> v2.20.3

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Release Notes

urfave/cli

### [`v2.20.3`](https://togithub.com/urfave/cli/releases/tag/v2.20.3) [Compare Source](https://togithub.com/urfave/cli/compare/v2.20.2...v2.20.3) #### What's Changed - Docs:(issue\_1276) Make destination/value/default text clear by [@​dearchap](https://togithub.com/dearchap) in [https://github.com/urfave/cli/pull/1539](https://togithub.com/urfave/cli/pull/1539) - Fix:(issue\_1263) FlagNames should return names set via env as well by [@​dearchap](https://togithub.com/dearchap) in [https://github.com/urfave/cli/pull/1537](https://togithub.com/urfave/cli/pull/1537) - Fix:(issue\_1288). Add windows specific env format by [@​dearchap](https://togithub.com/dearchap) in [https://github.com/urfave/cli/pull/1538](https://togithub.com/urfave/cli/pull/1538) **Full Changelog**: https://github.com/urfave/cli/compare/v2.20.2...v2.20.3

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