Update coveralls requirement from ==3.* to >=3,<5

Updates the requirements on [coveralls](https://github.com/TheKevJames/coveralls-python) to permit the latest version.
- [Release notes](https://github.com/TheKevJames/coveralls-python/releases)
- [Changelog](https://github.com/TheKevJames/coveralls-python/blob/master/CHANGELOG.md)
- [Commits](TheKevJames/coveralls-python@3.0.0...4.0.1)

---
updated-dependencies:
- dependency-name: coveralls
  dependency-version: 4.0.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -73,7 +73,7 @@ dev = [
     "jupyter","ipywidgets","ipykernel",
     # "sphinx","recommonmark",
     "black",
-    "coveralls == 3.*",
+    "coveralls >= 3,< 5",
     "flake8",
     "isort",
     "pytest-cov >= 2,< 7",
@@ -129,7 +129,7 @@ dev = [
     "jupyter","ipywidgets","ipykernel",
     # "sphinx","recommonmark",
     "black",
-    "coveralls == 3.*",
+    "coveralls >= 3,< 5",
     "flake8",
     "isort",
     "pytest-cov >= 2,< 7",