Bump the dev-deps group with 3 updates

Updates the requirements on [black](https://github.com/psf/black), [mypy](https://github.com/python/mypy) and [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.

Updates `black` to 26.3.1
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@26.1a1...26.3.1)

Updates `mypy` to 1.20.0
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.0...v1.20.0)

Updates `pytest-cov` to 7.1.0
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v7.0.0...v7.1.0)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 26.3.1
  dependency-type: direct:development
  dependency-group: dev-deps
- dependency-name: mypy
  dependency-version: 1.20.0
  dependency-type: direct:development
  dependency-group: dev-deps
- dependency-name: pytest-cov
  dependency-version: 7.1.0
  dependency-type: direct:development
  dependency-group: dev-deps
...

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

Author: dependabot[bot]

pyproject.toml

@@ -92,15 +92,15 @@ docs = [
 lint = [
     "pylint==4.0.*",
     "ruff==0.15.*",
-    "black==26.1.*",
-    "mypy==1.19.*",
+    "black==26.3.*",
+    "mypy==1.20.*",
 ]
 test = [
     "pytest==9.0.*",
     "pytest-timeout==2.4.*",
     "pytest-modern==0.7.*;platform_system!='Windows'",
     "coveralls==4.1.*",
-    "pytest-cov==7.0.*",
+    "pytest-cov==7.1.*",
     "coverage==7.13.*",
     "hypothesis==6.*",
     "parameterized==0.9.*",