Remove version constraints for sphinx and twine

Author: cclauss

tox.ini

@@ -37,7 +37,7 @@ commands =
 
 [testenv:docs]
 deps =
-    sphinx>=3.5,<5
+    sphinx
 allowlist_externals = make
 changedir = {toxinidir}/docs
 commands =
@@ -49,7 +49,7 @@ basepython = python3.9
 deps =
     check-manifest==0.46
     readme-renderer==29.0
-    twine>=3.4.1,<4
+    twine
 allowlist_externals = rm
 commands =
     rm -rf dist/