Add minimum versions for urllib3 and requests

Using urllib3>=2.0.0 to avoid the 403 Client error.¹

Adding minimum version for `requests` the first version that officially
supports urllib3 v2.²

See @tsibley's comment on _why_ upgrading `urllib3` resolved the 403
Client error.³

¹ <#7 (comment)>
² <https://github.com/psf/requests/releases/tag/v2.30.0>
³ <#7 (comment)>

setup.cfg

@@ -20,9 +20,10 @@ packages = find:
 python_requires = >=3.6
 install_requires =
     click >=8
-    requests
+    requests >=2.30.0
     rich
     pyyaml
+    urllib3 >=2.0.0
 
 [options.extras_require]
 maintainers-sync =