Refactor geth steps to pip install correct py-geth version

- Make sure pip is up to date
- Use quotes for pip install with minimum version ``pip install --user "py-geth>={version}"`` (https://pip.pypa.io/en/stable/cli/pip_install/#examples)

.circleci/config.yml

@@ -76,12 +76,14 @@ geth_steps: &geth_steps
           - cache-{{ .Environment.CIRCLE_JOB }}-{{ checksum "setup.py" }}-{{ checksum "tox.ini" }}
     - run:
         name: install dependencies
-        command: pip install --user tox
+        command: |
+          pip install --upgrade pip
+          pip install --user tox
     - run:
         name: build geth if missing
         command: |
           mkdir -p $HOME/.ethash
-          pip install --user py-geth>=<< pipeline.parameters.pygeth_version >>
+          pip install --user "py-geth>=<< pipeline.parameters.pygeth_version >>"
           export GOROOT=/usr/local/go
           echo << pipeline.parameters.geth_version >>
           export GETH_BINARY="$HOME/.py-geth/geth-<< pipeline.parameters.geth_version >>/bin/geth"

newsfragments/2898.internal.rst

@@ -0,0 +1,2 @@
+Update ``geth_steps`` in CircleCI builds to pip install the proper version of ``py-geth``.gs
+