feat(pkg): add update subcommand for modules

[Mralimoh]

Summary

Implements the missing update subcommand for spicetify pkg, allowing users to update installed modules either individually or all at once.

Changes

• CLI & Dispatcher: Added the update action to CliPkgAction and PkgAction with an optional id argument, covered under the standard mutation guard.
• Batch & Single Updates:
  • spicetify pkg update <id>: Updates the target module to the latest version resolved from the vault catalog.
  • spicetify pkg update: Scans all currently installed modules and updates those that have a newer version available.
• Lifecycle Management:
  • Compares versions via should_stage and resolves the target semver using resolve_version.
  • Downloads and verifies artifacts against the vault checksum.
  • Automatically updates the active link with enable_module.
  • Prunes superseded package versions from the store directory to avoid disk clutter.

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