Update package metadata

[AdrianoKF]

A few things in the package metadata need to be updated:

• Author email should point to an Institute mailbox (see https://github.com/aai-institute/MLOps-Engineering/issues/34)
• Development Status trove classifier can be moved from alpha to beta / released

[nicholasjng]

@aliabbasjaffri pointed out to me that zip-safe is obsolete, so that can go as well.

Source: https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html#setuptools-specific-configuration (third-last table entry)