Remove pinned python version from black precommit hook

Nobody has claimed this yet.

@camposandro and I have run into this with a couple incubees.

In the precommit template (https://github.com/lincc-frameworks/python-project-template/blob/main/python-project-template/.pre-commit-config.yaml.jinja), we set up the black hook with the following (note the last line, with **language_version**):
```jinja
{%- if 'black' in enforce_style %}
# Analyze the code style and report code that doesn't adhere.
- repo: https://github.com/psf/black
rev: 23.7.0
hooks:
- id: black-jupyter
name: Format code using black
types_or: [python, pyi, jupyter]
# It is recommended to specify the latest version of Python
# supported by your project here, or alternatively use
# pre-commit's default_language_version, see
# https://pre-commit.com/#top_level-default_language_version
language_version: python{{ py.pref(python_versions) }}
{%- endif %}
```

And two users have ended up with some version of `language_version: 3.11`, which caused errors for them.

We should either remove this line, or make it not do this kind of behavior

Start with python-project-template/.pre-commit-config.yaml.jinja and inspect how py.pref(python_versions) produces the hook's language_version. Check the linked pre-commit language-version guidance, then adjust the template so generated configurations do not impose a failing pinned Python version; verify the resulting configuration for affected projects.

Written by the indexing model from the issue text.