No boost dependency anymore

Newer GT4Py versions ship with a vendored in version of the boost header
file that it needs. And since NDSL updated its GT4Py version, we don't
need to install boost anymore in the `Dockerfile` for PyFV3. Not sure if
anyone uses the docker version, but it's easy enough to just clean up.

Author: romanc

Dockerfile

@@ -16,7 +16,6 @@ RUN apt-get update -y && \
     libgeos-dev \
     libopenmpi3 \
     libopenmpi-dev \
-    libboost-all-dev \
     libhdf5-serial-dev \
     libffi-dev \
     netcdf-bin \