Update keyring requirement from ~=17.1.1 to ~=19.0.2
Update keyring requirement from ~=17.1.1 to ~=19.0.2

Updates the requirements on [keyring](https://github.com/jaraco/keyring) to permit the latest version.
- [Release notes](https://github.com/jaraco/keyring/releases)
- [Changelog](https://github.com/jaraco/keyring/blob/master/CHANGES.rst)
- [Commits](https://github.com/jaraco/keyring/commits/19.0.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
r-darwish/pushbullet-cli