Remove pins on dev dependencies

Author: kclowes

setup.py

@@ -35,21 +35,21 @@
     ],
     "dev": [
         "bumpversion",
-        "flaky>=3.7.0,<4",
-        "hypothesis>=3.31.2,<6",
+        "flaky>=3.7.0",
+        "hypothesis>=3.31.2",
         "importlib-metadata<5.0;python_version<'3.8'",
-        "pytest>=6.2.5,<7",
-        "pytest-asyncio>=0.18.1,<0.19",
-        "pytest-mock>=1.10,<2",
+        "pytest>=6.2.5",
+        "pytest-asyncio>=0.18.1",
+        "pytest-mock>=1.10",
         "pytest-pythonpath>=0.3",
-        "pytest-watch>=4.2,<5",
-        "pytest-xdist>=1.29,<2",
+        "pytest-watch>=4.2",
+        "pytest-xdist>=1.29",
         "setuptools>=38.6.0",
         "tox>=1.8.0",
-        "tqdm>4.32,<5",
-        "twine>=1.13,<2",
+        "tqdm>4.32",
+        "twine>=1.13",
         "pluggy==0.13.1",
-        "when-changed>=0.3.0,<0.4",
+        "when-changed>=0.3.0",
     ],
 }