update SI_LULC_pipeline example due to changed import (#747)

Author: zigaLuksic

examples/land-cover-map/SI_LULC_pipeline.ipynb

@@ -97,7 +97,8 @@
     "    SaveTask,\n",
     "    linearly_connect_tasks,\n",
     ")\n",
-    "from eolearn.features import LinearInterpolationTask, NormalizedDifferenceIndexTask, SimpleFilterTask\n",
+    "from eolearn.features import NormalizedDifferenceIndexTask, SimpleFilterTask\n",
+    "from eolearn.features.extra.interpolation import LinearInterpolationTask\n",
     "from eolearn.geometry import ErosionTask, VectorToRasterTask\n",
     "from eolearn.io import ExportToTiffTask, SentinelHubInputTask, VectorImportTask\n",
     "from eolearn.ml_tools import FractionSamplingTask"