fix: include ping extras in tox testing

It is not needed for testing, but for type checking.

Author: nijel

tox.ini

@@ -12,18 +12,18 @@ allowlist_externals =
   uv
 install_command = uv pip install --no-binary lxml --no-binary xmlsec {opts} {packages}
 deps =
-  py{310,311,312,313}: -e .[dev,all]
+  py{310,311,312,313}: -e .[dev,all,ping]
 commands =
   pytest
 
 [testenv:py310-pyright]
 deps =
-  -e .[dev,all]
+  -e .[dev,all,ping]
 commands =
  pyright
 
 [testenv:py313-pyright]
 deps =
-  -e .[dev,all]
+  -e .[dev,all,ping]
 commands =
  pyright