Wrap stat overrides with st cache_data

src/login.py

@@ -155,6 +155,7 @@ def get_logged_in_user_name_email() -> tuple[str | None, str | None]:
 
 
 # hack - data overrides for stats allowing for quick manual edits
+@st.cache_data(ttl=60 * 2)
 def get_stat_overrides() -> dict[int, dict[str, dict[str, float]]]:
     df = conn.read(
         worksheet="stats-overrides",