pywellen: rewuire python 3.9 and update pyo3

hopefully this will let us solve this issue:
PyO3/pyo3#4265 (comment)

Author: ekiwi

pywellen/Cargo.toml

@@ -10,7 +10,6 @@ name = "pywellen"
 crate-type = ["cdylib"]
 
 [dependencies]
-bytemuck = "1.18.0"
 num-bigint = "0.4.6"
-pyo3 = { version = "0.22.5", features = ["num-bigint"] }
+pyo3 = { version = "0.23.3", features = ["num-bigint"] }
 wellen = { workspace = true }

pywellen/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "pywellen"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
   "Programming Language :: Rust",
   "Programming Language :: Python :: Implementation :: CPython",