Bumped version to 0.12.1 + fixed CI

Author: abey79

.github/workflows/release.yml

@@ -27,6 +27,7 @@ jobs:
     - name: Build
       id: build
       run: |
+        pip install wheel
         python setup.py build sdist bdist_wheel
 
     - name: Create Release

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name="vpype-gcode",
-    version="0.12.0",
+    version="0.12.1",
     description="vpype gcode plugin",
     long_description=readme,
     long_description_content_type="text/markdown",