DOC: Remove Android from pyproject.toml

Future support anticipated via ITK-Wasm.

Author: thewtex

pyproject.toml

@@ -21,7 +21,6 @@ classifiers = [
     "Intended Audience :: Healthcare Industry",
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: Apache Software License",
-    "Operating System :: Android",
     "Operating System :: MacOS",
     "Operating System :: Microsoft :: Windows",
     "Operating System :: POSIX",