Update installation.rst

add `numpy-stl` dep to Apple silicon workaround instructions

docs/installation.rst

@@ -108,7 +108,7 @@ A procedure for avoiding this issue is to install in a conda environment, which
 	conda install -c cadquery -c conda-forge cadquery=master
 	pip install --no-deps git+https://github.com/gumyr/build123d svgwrite svgpathtools anytree scipy
 	pip install --no-deps ocp_tessellate webcolors==1.12 numpy numpy-quaternion cachetools==5.2.0
-	pip install --no-deps ocp_vscode requests orjson urllib3 certifi
+	pip install --no-deps ocp_vscode requests orjson urllib3 certifi numpy-stl
 
 `You can track the issue here <https://github.com/CadQuery/ocp-build-system/issues/11#issuecomment-1407769681>`_