[ci] Stop skipping a test that no longer exists

Author: shs96c

.skipped-tests

@@ -28,7 +28,6 @@
 -//javascript/atoms:test-firefox-dev
 -//py:common-chrome-test/selenium/webdriver/common/virtual_authenticator_tests.py
 -//py:test-chrome-test/selenium/webdriver/chrome/chrome_launcher_tests.py
--//py:test-chrome-test/selenium/webdriver/chrome/proxy_tests.py
 -//py:test-chrome-test/selenium/webdriver/chrome/chrome_service_tests.py
--//py:auto-chrome-test/selenium/webdriver/common/virtual_authenticator_tests.py
+-//py:test-chrome-test/selenium/webdriver/chrome/proxy_tests.py
 -//py:unit-test/unit/selenium/webdriver/common/cdp_module_fallback_tests.py