Update module github.com/alexflint/go-arg to v1.5.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/alexflint/go-arg	v1.4.3 -> v1.5.1

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Release Notes

alexflint/go-arg (github.com/alexflint/go-arg)

v1.5.1

Compare Source

• Fixes a bug introduced in v1.5.0 where bad struct tags and other parser-level initialization problems would result in a crash rather than a clean exit in MustParse (thanks @​hhromic !)

v1.5.0: Version 1.5.0

Compare Source

• Argument structs can define Description() and Epilogue(), which are added to the usage string

• Subcommands can have multiple aliases like this:

var args struct {
    Remove *struct{} `arg:"subcommand:remove|rm|r" help:"remove something from somewhere"`
}

• Improves formatting of usage string when the placeholder tag is set to empty string

• Do not handle --version when the args struct lacks a Version() function

• Add StructSubcommands to Config struct

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