Bump version to 0.2.4

This change bumps the version of the crate to 0.2.4. The following
notable changes have been made since 0.2.3:
- Added the reset command to perform a factory reset
- Added the -V/--version option to print the program's version
- Check the status of a PWS slot before accessing it in pws get
- Added NITROCLI_NO_CACHE environment variable to bypass caching of
  secrets
- Clear cached PIN entry as part of pin set command to prevent
  spurious authentication failures
- Bumped libc dependency to 0.2.57
- Bumped cc dependency to 1.0.37

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