Update bootstrap.py for grammar in slow startup error log (home-assistant#157458)

Author: steaura

homeassistant/bootstrap.py

@@ -1000,7 +1000,7 @@ def _async_watch(self) -> None:
             # We log every LOG_SLOW_STARTUP_INTERVAL until all integrations are done
             # once we take over LOG_SLOW_STARTUP_INTERVAL (60s) to start up
             _LOGGER.warning(
-                "Waiting on integrations to complete setup: %s",
+                "Waiting for integrations to complete setup: %s",
                 self._setup_started,
             )
 

tests/test_bootstrap.py

@@ -727,7 +727,7 @@ async def test_setup_hass(
             ),
         )
 
-    assert "Waiting on integrations to complete setup" not in caplog.text
+    assert "Waiting for integrations to complete setup" not in caplog.text
 
     assert "browser" in hass.config.components
     assert "recovery_mode" not in hass.config.components
@@ -790,7 +790,7 @@ async def _async_setup_that_blocks_startup(*args, **kwargs):
             ),
         )
 
-    assert "Waiting on integrations to complete setup" in caplog.text
+    assert "Waiting for integrations to complete setup" in caplog.text
 
 
 async def test_setup_hass_invalid_yaml(