fix(deps): update dependency commander to v6.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
commander	dependencies	minor	6.1.0 -> 6.2.0

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Release Notes

tj/commander.js

v6.2.0

Compare Source

Added

• added 'tsx' file extension for stand-alone executable subcommands ([#​1368])
• documented second parameter to .description() to describe command arguments ([#​1353])
• documentation of special cases with options taking varying numbers of option-arguments ([#​1332])
• documentation for terminology ([#​1361])

Fixed

• add missing TypeScript definition for `.addHelpCommand()' ([#​1375])
• removed blank line after "Arguments:" in help, to match "Options:" and "Commands:" ([#​1360])

Changed

• update dependencies

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