[py] Remove assertion for python version check

[jsfehler]

Thanks for contributing to Selenium!
A PR well described will help maintainers to quickly review and merge it

Before submitting your PR, please check our contributing guidelines.
Avoid large PRs, help reviewers by making them as simple and short as possible.

Description

Remove assertions that check if the python version is 3.7 or above.

Motivation and Context

• New selenium versions only support python version 3.7+.
• Pip will not install an incompatible selenium version.

Types of changes

Tech debt.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #10815 (12aecd1) into trunk (2fbfc62) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            trunk   #10815      +/-   ##
==========================================
- Coverage   50.46%   50.43%   -0.03%     
==========================================
  Files          84       84              
  Lines        5477     5472       -5     
  Branches      278      278              
==========================================
- Hits         2764     2760       -4     
+ Misses       2435     2434       -1     
  Partials      278      278              

Impacted Files	Coverage Δ
py/selenium/webdriver/common/log.py	26.47% <ø> (-3.11%)	⬇️
py/selenium/webdriver/remote/webdriver.py	39.09% <ø> (-0.05%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2fbfc62...12aecd1. Read the comment docs.

[diemol]

@jsfehler can you please sign the CLA?