feat: Add support for Python 3.12 (#557)

* chore(python): Add Python 3.12

Source-Link: https://github.com/googleapis/synthtool/commit/af16e6d4672cc7b400f144de2fc3068b54ff47d2
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:bacc3af03bff793a03add584537b36b5644342931ad989e3ba1171d3bd5399f5

* Update common files to include python 3.12

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>
5 files changed