v0.21.0
=======

``CenterNetVisdrone`` torch fix for MPS devices, GitHub CI updates.

Updates / New Features
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CI/CD

* Updated Github Workflows from ``cache@v2`` to ``cache@v4``.

* To resolve issues with public forks lacking access to the Codecov
  token, we've included it directly in ``codecov.yml``. The file also
  documents the rationale for this security exception.

Fixes
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* Fixed a bug in ``CenterNetVisdrone`` that prevented running on MPS device.