Fixed dependencies around urllib pip module

Added a line to install 'urllib3<2.0' in the docker image.

The docker image fails to build due to the issue with the
dependencies. Firstly, 'urllib3<3,>=1.21.1' is installed
during the installation of the openstack packages.
After this, during installing the kubernetes pip module, it
requires 'google-auth>=1.0.1' which requires 'urllib3<2.0'
but the 2.0.3 version is already installed.

Related-PROD: PROD-37198
Change-Id: Ia238347528ee2f058e894460972996e26501651d
diff --git a/k8s/docker-mos-toolset-full b/k8s/docker-mos-toolset-full
index 0ce01e3..e764a4d 100644
--- a/k8s/docker-mos-toolset-full
+++ b/k8s/docker-mos-toolset-full
@@ -36,6 +36,7 @@
     cd /opt/cfg-checker && \
     python3 -m venv .checkervenv && \
     . .checkervenv/bin/activate && \
+    pip3 install --no-cache-dir 'urllib3<2.0' && \
     pip3 install --no-cache-dir -r requirements.txt && \
     python3 setup.py develop && \
     deactivate && \