⬆️ update to pybind11>=2.12 (#367)

## Description

This PR updates the minimum `pybind11` version to `2.12`, which was
released a couple weeks ago and brings several big improvements,
including compatibility with Numpy 2.0 which will be released soon.

## Checklist:

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This checklist serves as a reminder of a couple of things that ensure
your pull request will be merged swiftly.
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- [x] The pull request only contains commits that are related to it.
- [x] I have added appropriate tests and documentation.
- [x] I have made sure that all CI jobs on GitHub pass.
- [x] The pull request introduces no new warnings and follows the
project's style guidelines.

Signed-off-by: burgholzer <burgholzer@me.com>

noxfile.py

@@ -19,7 +19,7 @@
 BUILD_REQUIREMENTS = [
     "scikit-build-core[pyproject]>=0.8.1",
     "setuptools_scm>=7",
-    "pybind11>=2.11",
+    "pybind11>=2.12",
 ]
 
 if os.environ.get("CI", None):

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["scikit-build-core>=0.8.1", "setuptools-scm>=7", "pybind11>=2.11"]
+requires = ["scikit-build-core>=0.8.1", "setuptools-scm>=7", "pybind11>=2.12"]
 build-backend = "scikit_build_core.build"
 
 [project]

test/python/constraints.txt

@@ -1,5 +1,5 @@
 scikit-build-core==0.8.1
 setuptools-scm==7.0.0
-pybind11==2.11.0
+pybind11==2.12.0
 pytest==7.0.0
 qiskit==1.0.0