test(warnings): switch from the unmaintained pytest-freezegun to pytest-freezer removing warnings (main)

[noirbizarre]

Description

This PR backports #639 on master

[codecov]

Codecov Report

Base: 97.92% // Head: 98.42% // Increases project coverage by +0.50% 🎉

Coverage data is based on head (0ccbda4) compared to base (db42a95).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@ Coverage Diff @@## master #643 +/- ##
==========================================
+ Coverage 97.92% 98.42% +0.50% 
==========================================
Files 35 39 +4 Lines 1252 1653 +401 ==========================================
+ Hits 1226 1627 +401 
Misses 26 26 

Flag	Coverage Δ
unittests	98.42% <100.00%> (+0.50%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/commands/changelog.py	98.86% <100.00%> (ø)
commitizen/exceptions.py	100.00% <0.00%> (ø)
commitizen/__init__.py	100.00% <0.00%> (ø)
commitizen/bump.py	100.00% <0.00%> (ø)
commitizen/changelog.py	100.00% <0.00%> (ø)

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