Update module github.com/urfave/cli/v2 to v2.27.6

This MR contains the following updates:

Package	Type	Update	Change
github.com/urfave/cli/v2	require	patch	v2.27.4 -> v2.27.6

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Release Notes

urfave/cli (github.com/urfave/cli/v2)

v2.27.6

Compare Source

What's Changed

• Use usage template in subcommand help by @​meatballhat in https://github.com/urfave/cli/pull/1986
• Docs: Update cli.yml by @​dearchap in https://github.com/urfave/cli/pull/2015
• Fix:(issue_2069) Add sep for string slice by @​dearchap in https://github.com/urfave/cli/pull/2070

Full Changelog: https://github.com/urfave/cli/compare/v2.27.5...v2.27.6

v2.27.5

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What's Changed

• docs(flag): add UseShortOptionHandling description by @​BlackHole1 in https://github.com/urfave/cli/pull/1956
• [Backport] Fix: Use $0 env var to correctly retrieve the current active shell by @​asahasrabuddhe in https://github.com/urfave/cli/pull/1970
• Update dependencies in v2-maint by @​meatballhat in https://github.com/urfave/cli/pull/1980

Full Changelog: https://github.com/urfave/cli/compare/v2.27.4...v2.27.5

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