CI: Pin requests' version less than 2.32

The issue docker/docker-py#3113 seems to be resolved.
The pinned version of requests (2.28.1) is no longer compatible with the current
docker pip, resulting in errors like:

"Error connecting: Error while fetching server API version: Not supported URL scheme http+docker"

Firstly, we try to allow pip to install requests according to its dependency tree.
But, the issue still occurs on Ubuntu 22.04 where docker/docker-py#3256
looks relevant. The best solution so far is to pin the version of the package less than 2.32.

Initially, we attempted to allow pip to install requests according to its dependency tree.
However, the issue persists on Ubuntu 22.04, and it appears to be related to
docker/docker-py#3256.
The best solution so far is to pin the version of the package to less than 2.32.

Fixes: #381

Signed-off-by: Hyounggyu Choi <Hyounggyu.Choi@ibm.com>

tests/e2e/ansible/start_docker_registry.yaml

@@ -19,19 +19,15 @@
         state: present
       retries: 3
       delay: 10
-    # The docker pip is needed by the docker_container ansible module itself.
-    - name: Install docker pip
+    # The docker and requests pip packages are required by the docker_container ansible module itself.
+    # The requests package is pinned to a version less than 2.32 to avoid a bug
+    # at https://github.com/docker/docker-py/issues/3256
+    - name: Install docker and requests pip packages
       pip:
-        name: docker
-    # Due to a bug in requests 2.29.0 we need to downgrade it
-    # see https://github.com/docker/docker-py/issues/3113 
-    - name: Downgrade requests
-      shell: |
-        actual_version="$(pip3 show requests | grep Version | cut -d: -f2 | xargs)"
-        version_ge="$(echo -e "2.29.0\n$actual_version" | sort -V | head -1)"
-        if [ "$version_ge" = "2.29.0" ]; then
-            pip3 install requests==2.28.1
-        fi
+        name:
+          - docker
+          - requests<2.32
+        state: present
       retries: 3
       delay: 10
     - name: Start a docker registry