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/flag_duration.go

@@ -32,7 +32,10 @@ func (f *DurationFlag) GetDefaultText() string {
 	if f.DefaultText != "" {
 		return f.DefaultText
 	}
-	return f.defaultValue.String()
+	if f.defaultValueSet {
+		return f.defaultValue.String()
+	}
+	return f.Value.String()
 }
 
 // GetEnvVars returns the env vars for this flag
@@ -44,6 +47,7 @@ func (f *DurationFlag) GetEnvVars() []string {
 func (f *DurationFlag) Apply(set *flag.FlagSet) error {
 	// set default value so that environment wont be able to overwrite it
 	f.defaultValue = f.Value
+	f.defaultValueSet = true
 
 	if val, source, found := flagFromEnvOrFile(f.EnvVars, f.FilePath); found {
 		if val != "" {