Bump github.com/urfave/cli/v2 from 2.7.1 to 2.8.1

[dependabot[bot]]

Bumps github.com/urfave/cli/v2 from 2.7.1 to 2.8.1.

Release notes

Sourced from github.com/urfave/cli/v2's releases.

v2.8.1

What's Changed

• Run docs tests against current work tree by @​meatballhat in urfave/cli#1403
• Remove GPL2 dependency introduced in v2.7.0 by @​AkihiroSuda in urfave/cli#1405

Full Changelog: https://github.com/urfave/cli/compare/v2.8.0...v2.8.1

v2.8.0

What's Changed

• Add flag category support (#796) by @​michaeljs1990 / @​meatballhat in urfave/cli#1368
• Introduce override hooks for suggestions by @​meatballhat in urfave/cli#1396
• Point to the docs tree and site from top-level README by @​meatballhat in urfave/cli#1399

Full Changelog: https://github.com/urfave/cli/compare/v2.7.2...v2.8.0

v2.7.2

What's Changed

• Auto-detect zsh via SHELL (#1218) by @​z0rc / @​meatballhat in urfave/cli#1350
• Merging mostynb report source of parse errors by @​meatballhat in urfave/cli#1354
• Report the source of a value when we cannot parse it by @​mostynb in urfave/cli#1168
• Add a security policy document by @​meatballhat in urfave/cli#1365

Full Changelog: https://github.com/urfave/cli/compare/v2.7.1...v2.7.2

Commits

• 5ff4e2a Merge pull request #1405 from AkihiroSuda/remove-gpl2-dependency
• 3e31c9b CI: workaround for golang.org/x/tools error
• a14bd76 Remove GPL2 dependency introduced in v2.7.0
• 595cabc Merge pull request #1403 from urfave/gfmrun-current
• 8f47e6d Set absolute bash path
• 5edc1b9 Run docs tests against current work tree
• 2419700 Merge pull request #1399 from urfave/docs-pointer
• 9de0cd3 Merge pull request #1396 from urfave/suggestion-pluggability
• 9e65b4d Merge pull request #1368 from urfave/michaeljs1990-add-flag-category-support
• 4bca72c Merge remote-tracking branch 'origin/main' into michaeljs1990-add-flag-catego...
• Additional commits viewable in compare view

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