[BUG] Release versions include `-dirty`

[gabeschine]

Describe your environment

% docker run --rm -it --entrypoint bash ghcr.io/rtl-airband/rtlsdr-airband:v5.1.0
root@e2b9321d17c5:/app# ./rtl_airband -v
RTLSDR-Airband version v5.1.0-dirty