build(deps): bump github.com/urfave/cli/v2 from 2.25.7 to 2.26.0

Bumps [github.com/urfave/cli/v2](https://github.com/urfave/cli) from 2.25.7 to 2.26.0.
- [Release notes](https://github.com/urfave/cli/releases)
- [Changelog](https://github.com/urfave/cli/blob/main/docs/CHANGELOG.md)
- [Commits](https://github.com/urfave/cli/compare/v2.25.7...v2.26.0)

---
updated-dependencies:
- dependency-name: github.com/urfave/cli/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/urfave/cli/v2/suggestions.go

@@ -21,7 +21,7 @@ func suggestFlag(flags []Flag, provided string, hideHelp bool) string {
 
 	for _, flag := range flags {
 		flagNames := flag.Names()
-		if !hideHelp {
+		if !hideHelp && HelpFlag != nil {
 			flagNames = append(flagNames, HelpFlag.Names()...)
 		}
 		for _, name := range flagNames {