CI: Python 3.11 pipelines are failing

[phofl]

https://github.com/pandas-dev/pandas/actions/runs/3899495475/jobs/6659199176

FAILED pandas/tests/frame/test_unary.py::TestDataFrameUnaryOperators::test_pos_object[df0] - TypeError: bad operand type for unary +: 'str'

[MarcoGorelli]

I've made a PR to address this, although just installing the nightly numpy in macos results in some errors:

Requirement already satisfied: pip in /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages (22.3.1)
Requirement already satisfied: setuptools in /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages (65.5.0)
Collecting setuptools
  Downloading setuptools-65.7.0-py3-none-any.whl (1.2 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.2/1.2 MB 32.2 MB/s eta 0:00:00
Collecting wheel
  Using cached wheel-0.38.4-py3-none-any.whl (36 kB)
Installing collected packages: wheel, setuptools
  Attempting uninstall: setuptools
    Found existing installation: setuptools 65.5.0
    Uninstalling setuptools-65.5.0:
      Successfully uninstalled setuptools-65.5.0
Successfully installed setuptools-65.7.0 wheel-0.38.4
Looking in indexes: https://pypi.anaconda.org/scipy-wheels-nightly/simple
Collecting numpy
  Downloading https://pypi.anaconda.org/scipy-wheels-nightly/simple/numpy/1.25.0.dev0%2B363.gbb2769e12/numpy-1.25.0.dev0%2B363.gbb2769e12.tar.gz (10.9 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 10.9/10.9 MB 30.1 MB/s eta 0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'error'
  error: subprocess-exited-with-error
  
  × pip subprocess to install build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [3 lines of output]
      Looking in indexes: https://pypi.anaconda.org/scipy-wheels-nightly/simple
      ERROR: Could not find a version that satisfies the requirement setuptools==59.2.0 (from versions: none)
      ERROR: No matching distribution found for setuptools==59.2.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× pip subprocess to install build dependencies 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.
Error: Process completed with exit code 1.