Fix install with new pip resolver

Author: i80and

pyproject.toml

@@ -10,9 +10,8 @@ home-page = "https://github.com/mongodb/snooty-parser"
 classifiers = ["License :: OSI Approved :: Apache Software License"]
 requires-python = "~= 3.7"
 requires = [
-    "pymongo[srv,tls] ~= 3.10.1",
+    "pymongo[srv,tls] ~= 3.11.1",
     "docutils == 0.16",
-    "dnspython ~= 2.0.0",
     "watchdog ~= 0.10.3",
     "requests ~= 2.24.0",
     "toml ~= 0.10.1",