fix(pep440): Handle widening ranges with '~=' operator

[scemily13]

Changes

Update pep440 versioning to handle dependency ranges with the ~= operator when the versioning strategy is widen.

Context

Renovate is not correctly widening dependency ranges with the ~= operator.

Current functionality (e.g. new dependency version of 2.0.0):
Old range: ~=1.1.0
New range: ~=2.0.0

Correct functionality:
Old range: ~=1.1.0
New range: >=1.1.0,<3

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 32.66.8 🎉

The release is available on:

• GitHub release
• 32.66.8

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