chore(deps): update pyo3 requirement from 0.29 to 0.30 in /rust (#852)

* chore(deps): update pyo3 requirement from 0.29 to 0.30 in /rust

Updates the requirements on [pyo3](https://github.com/pyo3/pyo3) to permit the latest version.
- [Release notes](https://github.com/pyo3/pyo3/releases)
- [Changelog](https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md)
- [Commits](PyO3/pyo3@v0.29.0...v0.29.3)

---
updated-dependencies:
- dependency-name: pyo3
  dependency-version: 0.29.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* chore(deps): move rust-numpy to 0.30 in lockstep with pyo3 0.30

rust-numpy 0.N requires pyo3 ^0.N, so the pyo3-only bump cannot compile
(two pyo3-ffi versions would both link libpython). Fold the numpy 0.30
bump in here, refresh the Cargo.toml comment (pyo3 0.30 spans Python
3.9-3.15, MSRV 1.85 = our rust-version), and add a Dependabot group so
the pair arrives as one PR in future.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: igerber <isaac.gerber@gmail.com>

Author: dependabot[bot]

.github/dependabot.yml

@@ -25,6 +25,17 @@ updates:
       - "dependencies"
       - "rust"
     groups:
+      # pyo3 and rust-numpy are lockstep (numpy 0.N requires pyo3 ^0.N), so
+      # a lone bump of either cannot compile. Listed first so they land in
+      # this group rather than rust-minor-patch.
+      pyo3-stack:
+        patterns:
+          - "pyo3"
+          - "numpy"
+        update-types:
+          - "major"
+          - "minor"
+          - "patch"
       rust-minor-patch:
         update-types:
           - "minor"

rust/Cargo.toml

@@ -25,9 +25,10 @@ openblas = ["ndarray/blas"]
 alloc-profile = []
 
 [dependencies]
-# PyO3 0.29 supports Python 3.9-3.14
-pyo3 = "0.29"
-numpy = "0.29"
+# PyO3 0.30 supports Python 3.9-3.15 (pyo3 and numpy must move together:
+# rust-numpy 0.N requires pyo3 ^0.N)
+pyo3 = "0.30"
+numpy = "0.30"
 ndarray = { version = "0.17", features = ["rayon"] }
 rand = "0.10"
 rand_xoshiro = "0.8"