Fix ./bin/bump version.py on macOS

[AdamOrmondroyd]

Description

./bin/bump_version.py was not working on macOS, as its version of sed requires an backup for in-place editing, or an empty string to turn it off (-i'', without the space).

I tried to do something more subtle that would work cross-platform, but getting an empty string argument into subprocess.run() doesn't seem straightforward. I think a cleaner solution would be to automate this entirely in python or bash rather than mixing the two, but of course at the cost of a larger diff.

Fixes #355

Checklist:

• I have performed a self-review of my own code
• My code is PEP8 compliant (flake8 anesthetic tests)
• My code contains compliant docstrings (pydocstyle --convention=numpy anesthetic)
• New and existing unit tests pass locally with my changes (python -m pytest)
• I have added tests that prove my fix is effective or that my feature works
• I have appropriately incremented the semantic version number in both README.rst and anesthetic/_version.py

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8132626) to head (3c82a11).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #356   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        34           
  Lines         2978      2978           
=========================================
  Hits          2978      2978           

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[AdamOrmondroyd]

I think the macOS runners were having a bad time earlier, seems ok now

[williamjameshandley]

OSX madness, but never mind!

[williamjameshandley]

Apologies -- I didn't realise this was ready to go -- the red cross is misleading due to the failing but not essential checks.

[AdamOrmondroyd]

Apologies -- I didn't realise this was ready to go -- the red cross is misleading due to the failing but not essential checks.

the ❌ indeed do not spark joy. I kind of lost motivation with #359 since some of the warnings go away with recent development pandas