Fixing PyMC Labs broken link in README (#5251)

README.rst

@@ -171,7 +171,7 @@ Sponsors
    :target: http://www.numfocus.org/
 .. |NumFOCUS_badge| image:: https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A
    :target: http://www.numfocus.org/
-.. |PyMCLabs| image:: https://github.com/pymc-devs/pymc/blob/main/docs/pymc-labs-logo.png
+.. |PyMCLabs| image:: https://raw.githubusercontent.com/pymc-devs/pymc/main/docs/logos/sponsors/pymc-labs.png
    :target: https://pymc-labs.io
 .. |tidelift| image:: https://img.shields.io/badge/-lifted!-2dd160.svg?colorA=58595b&style=flat&logo=data:image/png;base64,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%2FwCjUTnDygkGoVERFQaZFlE9nreO%2BdM5u5wkifvuee892Pu3CyEcA0DeIc%2B9IwftJsR6Cko3uCjguZdjuBZhhwmYDjGrOC96WED41UtsgEdGEAPlmAfpuAbFF%2BFZLfoMfRBGzThDtLgePPwBIpdddGzOArhPHUXowbNptE2www6a%2Fm96Y3pHN7oQ1s%2B13pxt1ENaKzBFWyWzaJ%2BRO0C9Jny6VPSoKjLVbMDC5bn5OPuJF%2BBSe95PVEMuugY5AegS9fCh7BedP45hRnj8TC34QQUe9bTZyh2KgvFk2vc8GIlXyTfsvqr6bPpNgv52ynnlomZJNpB70Xhl%2Bf6Sa02p1bApEfnETwxVa%2Faj%2BW%2FFtHltmxS%2FO3krvpTtTnVgu%2F6gvHRFvG78Ef3kOe5PimJXycY74blT5R%2BAAAAAElFTkSuQmCC
    :target: https://tidelift.com/subscription/pkg/pypi-pymc3?utm_source=pypi-pymc3&utm_medium=referral&utm_campaign=enterprise