chore: bump version to v0.1.21 #133

Job	Run time
build (windows-latest, x64, win32-x64, echo "Setting up Windows hamlib from repository folder or ...	2m 34s
build (ubuntu-24.04-arm, arm64, linux-arm64, sudo apt-get update sudo apt-get install -y libhamli...	1m 51s
build (ubuntu-latest, x64, linux-x64, sudo apt-get update sudo apt-get install -y libhamlib-dev l...	52s
build (macos-latest, arm64, darwin-arm64, brew install hamlib pip3 install setuptools --break-sys...	6h 0m 18s
package	0s
cleanup	5s
	6h 5m 40s

Provide feedback