Revert installing the package during CI

This reverts commit cb161b5.
Installing the package during CI fails because of a broken dependency.
So until issue #589 is fixed, that step can't be part of the CI
workflow.

.github/workflows/ci.yaml

@@ -52,7 +52,3 @@ jobs:
         run: "python -m nox -s build"
         env:
           PLATFORM: ${{ matrix.os.image }}
-      - name: "Install the package"
-        run: "python -m nox -s install"
-        env:
-          PLATFORM: ${{ matrix.os.image }}

noxfile.py

@@ -1,4 +1,3 @@
-from pathlib import Path
 from pprint import pformat
 
 import nox
@@ -59,11 +58,3 @@ def build(session):
     session.install("twine")
     session.run("python", "setup.py", "bdist", "bdist_wheel")
     session.run("twine", "check", "dist/eTraGo*")
-
-
-@nox.session(python=["3", "3.8", "3.9", "3.10", "3.11"])
-def install(session):
-    """Install the package."""
-    setdefaults(session)
-    session.run("python", "-mpip", "install", "--upgrade", "pip")
-    session.run("python", "-mpip", "install", *Path("dist").glob("*.whl"))