rust: use `cpython` 0.7.2 crate to add support for Python 3.12 stable

rust: use `cpython` 0.7.2 crate to add support for Python 3.12

This will give us more headroom until we can migrate to PyO3 some day.

--- a/rust/Cargo.lock	Mon Jul 08 15:52:01 2024 +0200
+++ b/rust/Cargo.lock	Mon Jul 08 16:02:54 2024 +0200
@@ -236,9 +236,9 @@
 
 [[package]]
 name = "cpython"
-version = "0.7.1"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3052106c29da7390237bc2310c1928335733b286287754ea85e6093d2495280e"
+checksum = "43b398a2c65baaf5892f10bb69b52508bf7a993380cc4ecd3785aaebb5c79389"
 dependencies = [
  "libc",
  "num-traits",
@@ -912,9 +912,9 @@
 
 [[package]]
 name = "python3-sys"
-version = "0.7.1"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49f8b50d72fb3015735aa403eebf19bbd72c093bfeeae24ee798be5f2f1aab52"
+checksum = "0f53ef6740367a09718d2cd21ba15b0d7972342a38e554736bcee7773e45c9f5"
 dependencies = [
  "libc",
  "regex",