Bump the dev-dependencies group across 1 directory with 2 updates

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

Updates `numpy` to 2.1.3
- [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...v2.1.3)

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: sphinx
  dependency-type: direct:production
  dependency-group: dev-dependencies
...

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

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "opencv-python-headless", # For pin-tip detection.
     "aioca",                  # Required for CA support with ophyd-async.
     "p4p",                    # Required for PVA support with ophyd-async.
-    "numpy<2.0",              # Unpin when https://github.com/bluesky/ophyd-async/issues/387 resolved
+    "numpy<3.0",              # Unpin when https://github.com/bluesky/ophyd-async/issues/387 resolved
     "aiofiles",
     "aiohttp",
     "redis",
@@ -59,7 +59,7 @@ dev = [
     "pytest-cov",
     "pytest-random-order",
     "ruff",
-    "sphinx<7.4.6",              #  pinned due to https://github.com/sphinx-doc/sphinx/issues/12660
+    "sphinx<8.1.4",              #  pinned due to https://github.com/sphinx-doc/sphinx/issues/12660
     "sphinx-autobuild",
     "sphinx-copybutton",
     "sphinxcontrib-mermaid",