fix: pin test_base_url.py entries to version 2 so migration is skipped

MockConfigEntry defaults to version=1, which triggers
async_migrate_integration on component setup; that legacy path
indexes entry.data[CONF_API_KEY] directly and raised KeyError for the
new optional-api-key entry in test_api_key_optional, before
async_setup_entry (and thus AsyncOpenAI) was ever reached. Pin both
entries in this file to version=2/minor_version=7, matching the
config flow's current VERSION/MINOR_VERSION and conftest's
mock_config_entry fixture.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01739Seac5eMAfNwFeiwV5r4

tests/test_base_url.py

@@ -13,6 +13,8 @@ async def test_client_built_with_base_url(hass: HomeAssistant) -> None:
     entry = MockConfigEntry(
         domain=DOMAIN,
         data={"api_key": "sk-test", CONF_BASE_URL: "http://192.0.2.10:4000/v1"},
+        version=2,
+        minor_version=7,
     )
     entry.add_to_hass(hass)
 
@@ -32,6 +34,8 @@ async def test_api_key_optional(hass: HomeAssistant) -> None:
     entry = MockConfigEntry(
         domain=DOMAIN,
         data={CONF_BASE_URL: "http://192.0.2.10:4000/v1"},
+        version=2,
+        minor_version=7,
     )
     entry.add_to_hass(hass)