Upgrade twine from 4.0.2 to 5.1.1

Packaging opda with importlib_metadata 8.0.0 and twine 4.0.2 raises
an exception: "KeyError: 'license'". The exception results from a
change in importlib_metadata where requesting missing metadata used
to return None but now raises a KeyError. Upgrading twine to 5.1.1
resolves the issue.

For more information, see pypa/twine#977
which discusses the missing license metadata in twine 4.0.2, and
see pypa/twine#1125 for how the release
of importlib_metadata 8.0.0 triggered the issue.

pyproject.toml

@@ -68,7 +68,7 @@ test = [
 ]
 package = [
   "build == 1.0.3",
-  "twine == 4.0.2",
+  "twine == 5.1.1",
 ]
 ci = [
   "lxml == 5.1.0",