chore(dependencies): update dependency coverage to v7

Author: renovate[bot]

pyproject.toml

@@ -29,7 +29,7 @@ python = "^3.6"
 
 [tool.poetry.dev-dependencies]
 black = "^20.8b1"
-coverage = "^5.3.1"
+coverage = "^7.2.3"
 isort = "^5.8.0"
 tox = "^3.25.1"
 tox-gh-actions = "^2.9.1"