Update default Python versions (#3970)

Drops Python 3.8, which is EOL, see
https://devguide.python.org/versions/, and adds Python 3.12, which is
the default e.g. on Ubuntu 24.04 LTS.

build_tools/python_deploy/build_linux_packages.sh

@@ -16,7 +16,7 @@
 #   ./build_tools/python_deploy/build_linux_packages.sh
 #
 # Build specific Python versions and packages to custom directory:
-#   TM_PYTHON_VERSIONS="cp38-cp38 cp39-cp39" \
+#   TM_PYTHON_VERSIONS="cp39-cp39 cp310-cp310" \
 #   TM_PACKAGES="torch-mlir" \
 #   TM_OUTPUT_DIR="/tmp/wheelhouse" \
 #   ./build_tools/python_deploy/build_linux_packages.sh
@@ -46,7 +46,7 @@ TM_RELEASE_DOCKER_IMAGE="${TM_RELEASE_DOCKER_IMAGE:-quay.io/pypa/manylinux2014_$
 # ./build_tools/docker/Dockerfile
 TM_CI_DOCKER_IMAGE="${TM_CI_DOCKER_IMAGE:-powderluv/torch-mlir-ci:latest}"
 # Version of Python to use in Release builds. Ignored in CIs.
-TM_PYTHON_VERSIONS="${TM_PYTHON_VERSIONS:-cp38-cp38 cp310-cp310 cp311-cp311}"
+TM_PYTHON_VERSIONS="${TM_PYTHON_VERSIONS:-cp310-cp310 cp311-cp311 cp312-cp312}"
 # Location to store Release wheels
 TM_OUTPUT_DIR="${TM_OUTPUT_DIR:-${this_dir}/wheelhouse}"
 # What "packages to build"

docs/development.md

@@ -349,9 +349,9 @@ The following additional environmental variables can be used to customize your d
 ```
 
 * Custom Python Versions for Release builds:
-  Version of Python to use in Release builds. Ignored in CIs. Defaults to `cp38-cp38 cp39-cp39 cp310-cp310`
+  Version of Python to use in Release builds. Ignored in CIs. Defaults to `cp39-cp39 cp310-cp310 cp312-cp312`
 ```shell
-  TM_PYTHON_VERSIONS="cp38-cp38 cp39-cp39 cp310-cp310"
+  TM_PYTHON_VERSIONS="cp39-cp39 cp310-cp310 cp312-cp312"
 ```
 
 * Location to store Release build wheels