Bump the dev-dependencies group across 1 directory with 3 updates

Updates the requirements on [numpy](https://github.com/numpy/numpy), [pyside6](https://pyside.org) and [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.

Updates `numpy` to 2.1.2
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/RELEASE_WALKTHROUGH.rst)
- [Commits](numpy/numpy@v0.2.0...v2.1.2)

Updates `pyside6` from 6.7.0 to 6.8.0.1

Updates `sphinx` to 8.1.3
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.1.3/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v0.1.61611...v8.1.3)

---
updated-dependencies:
- dependency-name: numpy
  dependency-type: direct:production
  dependency-group: dev-dependencies
- dependency-name: pyside6
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
- dependency-name: sphinx
  dependency-type: direct:production
  dependency-group: dev-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -13,7 +13,7 @@ classifiers = [
 description = "Asynchronous Bluesky hardware abstraction code, compatible with control systems like EPICS and Tango"
 dependencies = [
     "networkx>=2.0",
-    "numpy<2.0.0",
+    "numpy<3.0.0",
     "packaging",
     "pint",
     "bluesky>=1.13.0a3",
@@ -56,7 +56,7 @@ dev = [
     "pydata-sphinx-theme>=0.12",
     "pyepics>=3.4.2",
     "pyright",
-    "pyside6==6.7.0",
+    "pyside6==6.8.0.1",
     "pytest",
     "pytest-asyncio",
     "pytest-cov",
@@ -65,7 +65,7 @@ dev = [
     "pytest-rerunfailures",
     "pytest-timeout",
     "ruff",
-    "sphinx<7.4.0",              # https://github.com/bluesky/ophyd-async/issues/459
+    "sphinx<8.2.0",              # https://github.com/bluesky/ophyd-async/issues/459
     "sphinx-autobuild",
     "autodoc-pydantic",
     "sphinxcontrib-mermaid",