⬆️ Refresh poetry.lock file packages

Bumps several packages in the lockfile using `poetry lock && poetry install`:
- parso (0.7.0 -> 0.7.1)
- jedi (0.17.1 -> 0.17.2)
- numpy (1.19.0 -> 1.19.1)
- pillow (7.1.2 -> 7.2.0)
- prompt-toolkit (3.0.5 -> 3.0.6)
- pyzmq (19.0.1 -> 19.0.2)
- idna (2.9 -> 2.10)
- ipython (7.15.0 -> 7.17.0)
- jupyter-client (6.1.3 -> 6.1.6)
- pyviz-comms (0.7.5 -> 0.7.6)
- urllib3 (1.25.9 -> 1.25.10)
- argon2-cffi (20.1.0)
- ipykernel (5.3.0 -> 5.3.4)
- llvmlite (0.32.1 -> 0.31.0)
- pandas (1.0.5 -> 1.1.0)
- yarl (1.4.2 -> 1.5.1)
- appdirs (1.4.3 -> 1.4.4)
- cftime (1.1.3 -> 1.2.1)
- fsspec (0.7.4 -> 0.8.0)
- notebook (6.0.3 -> 6.1.1)
- numba (0.47.0 -> 0.48.0)
- psutil (5.7.0 -> 5.7.2)
- scipy (1.5.0 -> 1.5.2)
- tblib (1.6.0 -> 1.7.0)
- jupyterlab-server (1.1.5 -> 1.2.0)
- msgpack-numpy (0.4.6.post0 -> 0.4.6.1)
- netcdf4 (1.5.3 -> 1.5.4)
- pyarrow (0.17.1 -> 1.0.0)
- pyproj (2.6.0 -> 2.6.1.post1)
- regex (2020.6.8 -> 2020.7.14)