[PRM-764-1] Remove Python legacy setup (#313)

Author: samfallowfield

services/mesh-forwarder/Dockerfile

@@ -22,7 +22,7 @@ COPY . .
 RUN python -m venv /opt/venv
 ENV PATH="/opt/venv/bin:$PATH"
 
-RUN pip install pipenv
+RUN pip install --upgrade pip pipenv setuptools
 
 # Install dependencies into the current env instead of creating another venv
 RUN pipenv install --deploy --system

services/mesh-forwarder/pyproject.toml

@@ -1,3 +1,3 @@
 [build-system]
 requires = ["setuptools", "wheel"]
-build-backend = "setuptools.build_meta:__legacy__"
+build-backend = "setuptools.build_meta"