fix jenkins wrong interpretation of type

Author: NicolasColombi

climada/hazard/tc_tracks.py

@@ -3034,8 +3034,9 @@ def compute_track_density(
     """
 
     limit_ratio = 1.12 * 1.1  # record tc speed 112km/h -> 1.12°/h + 10% margin
+    time_value: float = tc_track.data[0].time_step[0].values  # Type hint for jenkins
 
-    if tc_track.data[0].time_step[0].values > (res / limit_ratio):
+    if time_value > (res / limit_ratio):
         warnings.warn(
             "The time step is too big for the current resolution. For the desired resolution, \n"
             f"apply a time step of {res/limit_ratio}h."