chore: Remove certifi dependency from docs (#235)

Author: keelerm84

pyproject.toml

@@ -77,7 +77,6 @@ optional = true
 [tool.poetry.group.docs.dependencies]
 sphinx = ">=6,<8"
 sphinx-rtd-theme = ">=1.3,<3.0"
-certifi = ">=2018.4.16"
 expiringdict = ">=1.1.4"
 pyrfc3339 = ">=1.0"
 jsonpickle = ">1.4.1"