gnu: openconnect-sso: Remove a transitive dependency on QtWebKit.

See <https://issues.guix.gnu.org/53289> for more information about this change.

* gnu/packages/vpn.scm (openconnect-sso)[inputs]: Replace python-pyqt with
python-pyqt-without-qtwebkit.

gnu/packages/vpn.scm

@@ -659,7 +659,7 @@ and probably others.")
            python-lxml
            python-prompt-toolkit
            python-requests
-           python-pyqt
+           python-pyqt-without-qtwebkit
            python-pyqtwebengine
            python-pysocks
            python-pyxdg