installing dependancies from requirements.txt fails at psycopg2 (line 23)

The installation exits and returns the following output:

```
Collecting psycopg2==2.9.6 (from -r requirements.txt (line 23))
Using cached psycopg2-2.9.6.tar.gz (383 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [35 lines of output]
/tmp/pip-build-env-9iz6921y/overlay/lib/python3.11/site-packages/setuptools/config/setupcfg.py:293: _DeprecatedConfig: Deprecated config in `setup.cfg`
!!

********************************************************************************
The license_file parameter is deprecated, use license_files instead.

By 2023-Oct-30, you need to update your project and remove deprecated calls
or your builds will no longer be supported.

See https://setuptools.pypa.io/en/latest/userguide/declarative_config.html for details.
********************************************************************************

!!
parsed = self.parsers.get(option_name, lambda x: x)(value)
running egg_info
writing psycopg2.egg-info/PKG-INFO
writing dependency_links to psycopg2.egg-info/dependency_links.txt
writing top-level names to psycopg2.egg-info/top_level.txt

Error: pg_config executable not found.

pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:

python setup.py build_ext --pg-config /path/to/pg_config build ...

or with the pg_config option in 'setup.cfg'.

If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.

For further information please check the 'doc/src/install.rst' file (also at
).

[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.
```

this is likely fixed by replacing `psycopg2` in `requirements.txt` with `psycopg2-binary`.