Fix numpy warning

#2583 (comment)

Author: VeckoTheGecko

src/parcels/_core/particlefile.py

@@ -164,15 +164,17 @@ def _to_write_particles(particle_data, time):
                 time - np.abs(particle_data["dt"] / 2),
                 particle_data["time"],
                 where=np.isfinite(particle_data["time"]),
+                out=None,
             )
             & np.greater_equal(
                 time + np.abs(particle_data["dt"] / 2),
                 particle_data["time"],
                 where=np.isfinite(particle_data["time"]),
+                out=None,
             )  # check time - dt/2 <= particle_data["time"] <= time + dt/2
             | (
                 (np.isnan(particle_data["dt"]))
-                & np.equal(time, particle_data["time"], where=np.isfinite(particle_data["time"]))
+                & np.equal(time, particle_data["time"], where=np.isfinite(particle_data["time"]), out=None)
             )  # or dt is NaN and time matches particle_data["time"]
         )
         & (np.isfinite(particle_data["trajectory"]))