Update tox requirement from <=4.15.1,>=4.15.1 to >=4.15.1,<=4.16.0 (#7054)

Updates the requirements on [tox](https://github.com/tox-dev/tox) to permit the latest version.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/main/docs/changelog.rst)
- [Commits](https://github.com/tox-dev/tox/compare/4.15.1...4.16.0)

---
updated-dependencies:
- dependency-name: tox
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -72,7 +72,7 @@ dev = [
     "pytest-xdist>=3.5.0,<=3.6.1",
     "pytest>=8.2.2,<=8.3.2",
     "requests>=2.9.1,<=2.32.3",
-    "tox<=4.15.1,>=4.15.1",
+    "tox>=4.15.1,<=4.16.0",
     "wheel>=0.36.2,<=0.43",
     "build>=0.10.0,<=1.2.1",
     "mypy<=1.10.1,>=1.10.1",