chore(python): use ubuntu 22.04 in docs image (#765)

Source-Link: googleapis/synthtool@f15cc72
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:bc5eed3804aec2f05fad42aacf973821d9500c174015341f721a984a0825b6fd

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,4 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:7cffbc10910c3ab1b852c05114a08d374c195a81cdec1d4a67a1d129331d0bfe
+  digest: sha256:bc5eed3804aec2f05fad42aacf973821d9500c174015341f721a984a0825b6fd
+# created: 2022-04-21T15:43:16.246106921Z

.kokoro/docker/docs/Dockerfile

@@ -4,7 +4,7 @@
 # license that can be found in the LICENSE file or at
 # https://developers.google.com/open-source/licenses/bsd
 
-from ubuntu:20.04
+from ubuntu:22.04
 
 ENV DEBIAN_FRONTEND noninteractive
 
@@ -52,8 +52,24 @@ RUN apt-get update \
   && rm -rf /var/lib/apt/lists/* \
   && rm -f /var/cache/apt/archives/*.deb
 
+###################### Install python 3.8.11
+
+# Download python 3.8.11
+RUN wget https://www.python.org/ftp/python/3.8.11/Python-3.8.11.tgz
+
+# Extract files
+RUN tar -xvf Python-3.8.11.tgz
+
+# Install python 3.8.11
+RUN ./Python-3.8.11/configure --enable-optimizations
+RUN make altinstall
+
+###################### Install pip
 RUN wget -O /tmp/get-pip.py 'https://bootstrap.pypa.io/get-pip.py' \
-  && python3.8 /tmp/get-pip.py \
+  && python3 /tmp/get-pip.py \
   && rm /tmp/get-pip.py
 
+# Test pip
+RUN python3 -m pip
+
 CMD ["python3.8"]