Upgrade Python to 3.12 for docuploader in publish_javadoc.sh

PiperOrigin-RevId: 819820626
Change-Id: I7dbbba78f8e740c118f0faaf7cbdcf44d23c7ab7

Author: ludoch

kokoro/gcp_ubuntu/publish_javadoc.sh

@@ -19,17 +19,27 @@ set -e
 shopt -s globstar
 
 setup_docuploader() {
- curl -fsSL --retry 10 -o /tmp/jar1.jar https://github.com/googleapis/java-docfx-doclet/releases/download/1.9.0/docfx-doclet-1.9.0-jar-with-dependencies.jar
- # Update Python 3 and Maven
- sudo apt-get update
- sudo apt-get install -y software-properties-common
- sudo add-apt-repository -y ppa:deadsnakes/ppa
- sudo apt-get update
- sudo apt-get install -y python3.12 python3.12-venv python3-pip maven
+curl -fsSL --retry 10 -o /tmp/jar1.jar https://github.com/googleapis/java-docfx-doclet/releases/download/1.9.0/docfx-doclet-1.9.0-jar-with-dependencies.jar
+# Update Python 3 and Maven
+
+# Refresh repositories and general system update
+sudo apt update && sudo apt upgrade -y
+sudo apt-get install -y software-properties-common
+# Required to refresh and add new PPA for Python3.12
+sudo add-apt-repository -y ppa:deadsnakes/ppa
+sudo apt update
+# Upgrade Python 3.8 to Python 3.12
+sudo apt install -y python3.12 python3.12-venv maven
+
+
  # install docuploader package with upgrade to get latest correct versions.
  echo "Trying to install gcp-docuploader."
  python3.12 -m venv env
  source env/bin/activate
+
+# Print Python version, should print 3.12
+python --version
+
 cat > /tmp/requirements.txt << EOF
 #
 # This file is autogenerated by pip-compile with Python 3.12