Fix license in citation file (#1916)

Incorrect license value caused a parsing error.

Author: sethfischer

CITATION.cff

@@ -1,6 +1,6 @@
 cff-version: 1.2.0
 doi: 10.5281/zenodo.10513848
-license: "Apache 2.0"
+license: "Apache-2.0"
 url: https://github.com/CadQuery/cadquery
 title: "CadQuery"
 message: "If you use this software, please cite it using these metadata."