feat: Upgrade Python to version 3.10

CHANGELOG.md

@@ -7,6 +7,7 @@ for the list of changes in SaltStack.
 **3004.2_1**
 
 - Change Docker base image to `ubuntu:jammy-20220531`
+- Upgrade Python to version `3.10`
 
 **3004.2**
 

Dockerfile

@@ -6,7 +6,7 @@ ARG VCS_REF
 # https://github.com/saltstack/salt/releases
 # NOTE: Review org.label-schema.version label if necessary
 ENV SALT_VERSION="3004.2" \
-    PYTHON_VERSION="3.9"
+    PYTHON_VERSION="3.10"
 
 ENV SALT_DOCKER_DIR="/etc/docker-salt" \
     SALT_ROOT_DIR="/etc/salt" \