Remove C Python headers from pyo3 build actions (bazelbuild#4095)

bazelbuild#4024 introduced a warning
for targets adding CC deps in `deps`. The warning calls out putting this
in `link_deps` or `cc_deps`. The latter makes more sense here... but
doesn't actually exist. However, I don't think this matters anyways, as
I don't think it's needed (this works with an internal codebase).

Author: Ahajha

extensions/pyo3/private/pyo3.bzl

@@ -333,7 +333,6 @@ def pyo3_extension(
         data = data,
         deps = [
             Label("//private:current_rust_pyo3_toolchain"),
-            Label("@rules_python//python/cc:current_py_cc_headers"),
         ] + deps,
         edition = edition,
         proc_macro_deps = proc_macro_deps,