Use newer, less hacky ykman

.github/workflows/build.yml

@@ -176,6 +176,11 @@ jobs:
         run: |
              set +e
              $pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 $pip install -U --force-reinstall
+
+             # install ykman from source to use latest with fewer deps
+             git clone https://github.com/Yubico/yubikey-manager.git
+             $pip install yubikey-manager/
+
              $pip install --upgrade -r requirements.txt
 
       - name: Build GAM with PyInstaller