Support Python up to 3.12 and drop 3.7

[philomath213]

Description

• Add Python 3.12 Support and drop Python 3.7
• Update version to 0.3.15

Fixes #487, #484, #483, #475, #470, #469, #463, #458

Affected Dependencies

Upgrade pybind11 to v2.12.0

How has this been tested?

• GitHub Actions

Checklist

• I have followed the Contribution Guidelines and Code of Conduct
• I have commented my code following the OpenMined Styleguide
• I have labeled this PR with the relevant Type labels
• My changes are covered by tests

[youben11]

Since you are updating the setup python action, can you pin the version by hash instead of a tag?

[philomath213]

Apparently, the new release of the Bazel package rules_python introduced a complex dependency issue (another similar issue), I don't have a clear idea of how to solve it at the moment.

We will probably need to migrate to the Bzlmod and rewrite the entire Bazel build since WORKSPACE is deprecated. It's better to address this issue in another PR.

[philomath213]

Since you are updating the setup python action, can you pin the version by hash instead of a tag?

Done