Fix warnings

This MR should fix some warnings which are shown in the pipelines.

doc/notebooks/demo_thermalized_lbm.ipynb

@@ -94,7 +94,7 @@
        "        "
       ],
       "text/plain": [
-       "<lbmpy.methods.momentbased.momentbasedmethod.MomentBasedLbMethod at 0x7fee5d180fd0>"
+       "<lbmpy.methods.momentbased.momentbasedmethod.MomentBasedLbMethod at 0x7f53ba131fa0>"
       ]
      },
      "execution_count": 2,
@@ -182,7 +182,7 @@
        "        "
       ],
       "text/plain": [
-       "<lbmpy.methods.momentbased.momentbasedmethod.MomentBasedLbMethod at 0x7fee54d8ee80>"
+       "<lbmpy.methods.momentbased.momentbasedmethod.MomentBasedLbMethod at 0x7f53b1d12a90>"
       ]
      },
      "execution_count": 3,
@@ -265,7 +265,7 @@
     "\n",
     "linear_congruent_rng_eqs = [ps.Assignment(seedField(i), seedField(i) * 1664525 + 1013904223) \n",
     "                            for i, _ in enumerate(random_number_symbols)]\n",
-    "floatEqs = [ps.Assignment(ps.TypedSymbol(s.name, np.float), seedField(i) / max_seed_type)\n",
+    "floatEqs = [ps.Assignment(ps.TypedSymbol(s.name, np.float64), seedField(i) / max_seed_type)\n",
     "            for i, s in enumerate(random_number_symbols)]\n",
     "                      \n",
     "rng_eqs = linear_congruent_rng_eqs + floatEqs + [ps.Assignment(debug_output.center, seedField(0) / max_seed_type)]\n",