fix(version): fix the behavior of cz version --major

[bearomorphism]

Description

Fixed the behavior of --major and --minor. Added tests.

Before this PR

cz version --major
# 4.10.0

After this PR

cz version --major
# 4

Checklist

• I have read the contributing guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v4-10-1@f52f532). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff             @@
##             v4-10-1    #1673   +/-   ##
==========================================
  Coverage           ?   98.60%           
==========================================
  Files              ?       60           
  Lines              ?     2649           
  Branches           ?        0           
==========================================
  Hits               ?     2612           
  Misses             ?       37           
  Partials           ?        0           

Flag	Coverage Δ
unittests	98.60% <100.00%> (?)

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