These are unused by maturin since 0.14.0 (non-issue for us),
and still having them is now fatal rather than a warning.
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,11 +11,2 @@
 
-[package.metadata.maturin]
-classifier = [
-    "Programming Language :: Python",
-    "Programming Language :: Rust",
-    "License :: OSI Approved :: MIT License",
-    "License :: OSI Approved :: Apache Software License",
-]
-requires-python = ">=3.7"
-
 [profile.release]