Handling getdefaultlocale() deprecation warnings

[caronc]

Description:

Related issue (if applicable): #659

Deprecation warnings of the locale handling in Apprise taken care of. Some backwards compatibility carried forward allowing users to set the LC_ALL, LC_TYPE LANG, and LANGUAGE environment variables (in that order) to over-ride default settings.

This change will allow Apprise Locale to function correctly after Python v3.13 and eliminate deprecation warnings that show on Python v3.11+

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@659-locale-deprecation-handling

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" "schema://"

# No Deprecation warnings will now be displayed on versions of Apprise running Python v3.11 or newer. 

[codecov-commenter]

Codecov Report

Patch coverage: 90.47% and project coverage change: -0.02% ⚠️

Comparison is base (e46f8fe) 99.52% compared to head (e76598f) 99.51%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
- Coverage   99.52%   99.51%   -0.02%     
==========================================
  Files         123      123              
  Lines       16328    16345      +17     
  Branches     3327     3329       +2     
==========================================
+ Hits        16251    16266      +15     
- Misses         68       70       +2     
  Partials        9        9              

Files Changed	Coverage Δ
apprise/utils.py	99.59% <66.66%> (-0.41%)	⬇️
apprise/AppriseLocale.py	100.00% <100.00%> (ø)

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