Remove deprecated fix-encoding-pragma, add pyupgrade

[PPsyrius]

Proposed change

This PR switches out fix-encoding-pragma hook for pyupgrade.

I noticed that the fix-encoding-pragma used in make pre-commit is listed as deprecated, as seen here:

As written in pre-commit-hooks pypl page:

fix-encoding-pragma
Deprecated since py2 is EOL - use pyupgrade instead.

Add # -- coding: utf-8 -- to the top of python files.
To remove the coding pragma pass --remove (useful in a python3-only codebase)

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/pin/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[PPsyrius]

Unlike the pre-commit results here, I can ascertain that these changes run correctly on my machine.

[KJhellico]

It's great update! But we also need to fix tests/test_i10n.py.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[arkid15r]

Cool stuff, thanks @PPsyrius !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (34dc910) to head (2ddb2c3).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev     #2007   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files          188       188           
  Lines        11409     11409           
  Branches      1791      1791           
=========================================
  Hits         11409     11409           

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