⬆️ Update pytest requirement from <9,>=8 to >=9,<10 (#1063)

* ⬆️ Update pytest requirement from <9,>=8 to >=8,<10

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.0.0...9.0.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.1
  dependency-type: direct:development
...

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

* Update pyproject.toml

* Update pyproject.toml

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>

Author: dependabot[bot]

pyproject.toml

@@ -69,7 +69,7 @@ testing = [
     "beautifulsoup4",
     "coverage[toml]",
     "defusedxml",  # required by sphinx 7.3 testing utils
-    "pytest>=8,<9",
+    "pytest>=9,<10",
     "pytest-cov",
     "pytest-regressions",
     "pytest-param-files~=0.6.0",
@@ -78,7 +78,7 @@ testing = [
 ]
 testing-docutils = [
     "pygments",
-    "pytest>=8,<9",
+    "pytest>=9,<10",
     "pytest-param-files~=0.6.0",
 ]