v0.21.0

CenterNetVisdrone torch fix for MPS devices, GitHub CI updates.

Updates / New Features

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

• Fixed a bug in CenterNetVisdrone that prevented running on MPS device.