Version bump 4.5.2

[nijel]

Proposed changes

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Types of changes

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• [x] Release (new release request)
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Code style update (PEP8, lint, formatting, renaming, etc)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Build related changes (build process, tests runner, etc)
• [ ] Other (please describe):

Checklist

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• [ ] Lint and unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added documentation to https://github.com/python-social-auth/social-docs

Other information

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a5a34d5) 77.70% compared to head (dd6eef6) 77.70%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #876 +/- ## ======================================= Coverage 77.70% 77.70% ======================================= Files 345 345 Lines 10574 10574 Branches 699 699 ======================================= Hits 8217 8217 Misses 2200 2200 Partials 157 157 ``` | [Flag](https://app.codecov.io/gh/python-social-auth/social-core/pull/876/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=python-social-auth) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/python-social-auth/social-core/pull/876/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=python-social-auth) | `77.70% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=python-social-auth#carryforward-flags-in-the-pull-request-comment) to find out more.

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