Update module github.com/urfave/cli/v2 to v2.23.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/urfave/cli/v2	require	patch	v2.23.5 -> v2.23.6

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Release Notes

urfave/cli

### [`v2.23.6`](https://togithub.com/urfave/cli/releases/tag/v2.23.6) [Compare Source](https://togithub.com/urfave/cli/compare/v2.23.5...v2.23.6) #### What's Changed - Disable slice flag separator by [@​feedmeapples](https://togithub.com/feedmeapples) in [https://github.com/urfave/cli/pull/1588](https://togithub.com/urfave/cli/pull/1588) - Fix:(issue\_1591) Use AppHelpTemplate instead of subcommand help template by [@​dearchap](https://togithub.com/dearchap) in [https://github.com/urfave/cli/pull/1608](https://togithub.com/urfave/cli/pull/1608) **Full Changelog**: https://github.com/urfave/cli/compare/v2.23.5...v2.23.6

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