Force utf 8 encoding on writes

[coordt]

Fixes #157

The problem was that it failed to write the configuration file because of a character-encoding problem. This forces all writes to use UTF-8.

[github-actions]

Version hint: patch
Current version: 0.19.2
New version (when merged): 0.19.3

_{Comment ID: Display the version hint-auto-generated}

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 93.44%. Comparing base (2e55fa1) to head (84254e0).
Report is 4 commits behind head on master.

Files	Patch %	Lines
bumpversion/cli.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #163   +/-   ##
=======================================
  Coverage   93.44%   93.44%           
=======================================
  Files          24       24           
  Lines        1479     1479           
  Branches      295      295           
=======================================
  Hits         1382     1382           
  Misses         68       68           
  Partials       29       29           

Flag	Coverage Δ
python-3.10	93.44% <66.66%> (ø)
python-3.11	93.44% <66.66%> (ø)
python-3.8	93.44% <66.66%> (ø)
python-3.9	93.44% <66.66%> (ø)

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[github-actions]

PR Preview Action v1.4.7
🚀 Deployed preview to https://callowayproject.github.io/bump-my-version/pr-preview/pr-163/
on branch gh-pages at 2024-03-23 14:17 UTC

[melMass]

I think it's related to my issue, I get this on bump all of a sudden:

bump-my-version bump minor
Exception in thread Thread-25 (_readerthread):
Traceback (most recent call last):
  File "C:\Users\User\.pyenv\pyenv-win\versions\3.11.3\Lib\threading.py", line 1038, in _bo
otstrap_inner
    self.run()
  File "C:\Users\User\.pyenv\pyenv-win\versions\3.11.3\Lib\threading.py", line 975, in run 
    self._target(*self._args, **self._kwargs)
  File "C:\Users\User\.pyenv\pyenv-win\versions\3.11.3\Lib\subprocess.py", line 1568, in _r
eaderthread
    buffer.append(fh.read())
                  ^^^^^^^^^
  File "C:\Users\User\.pyenv\pyenv-win\versions\3.11.3\Lib\encodings\cp1252.py", line 23, i
n decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeDecodeError: 'charmap' codec can't decode byte 0x8f in position 20: character maps t
o <undefined>