Prepare 1.2

[CaselIT]

• [x] modernize setup: https://gerrit.sqlalchemy.org/c/sqlalchemy/mako/+/3078
• [x] drop py2: https://gerrit.sqlalchemy.org/c/sqlalchemy/mako/+/3078
• [x] github workflow: https://gerrit.sqlalchemy.org/c/sqlalchemy/mako/+/3078
• [x] improve code: see https://github.com/sqlalchemy/mako/pull/335
• [x] update black : redo https://github.com/sqlalchemy/mako/pull/312
• [x] remove pkg_resource usage #347
• [x] #351
• [x] #352

[jvanasco]

For the "update black" item, I suggest re-doing PR #312, which standardizes the black integration into the same config as other sqlalchemy projects:

• migrate black config to pyproject.toml
• update black version

If you have time, I would also copy/paste this:

• update README to showcase code-of-conduct and development links

[bourke]

Implemented in c8140243