Fix Docker dev environment set up

[charlespnh]

Please add a meaningful description for your change here

I was setting up the dev environment using Docker and came across these errors...

1. python12-disutils not found - From https://docs.python.org/3.10/whatsnew/3.10.html#distutils-deprecated, it looks like distutils is deprecated and removed in python 3.12 in place of setuptools which we already installed with python3-setuptools.
2. NullPointerException when running task :sdks:java:core:compileJava - From the Docker image I was using Java 8 and got this NPE error. If I used Java 11, it was fine. Based on the contributor-docs/code-change-guide.md, Java 11 is preferrable but in the CONTRIBUTING.md Java 8 is still being recommended...

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[liferoad]

Thanks for checking this. We do not support Python 3.6 now. So porably we can update https://github.com/apache/beam/blob/master/dev-support/docker/Dockerfile#L65. The java8 error is strange, which probably means java8 is not installed correctly.

[charlespnh]

I'll see if I can reproduce this java 8 error with a github action... I didn't manually install these dependencies so kinda hard to believe that java 8 was not installed correctly for me...

[charlespnh]

We do not support Python 3.6 now. So porably we can update https://github.com/apache/beam/blob/master/dev-support/docker/Dockerfile#L65.

Removed.

The java8 error is strange, which probably means java8 is not installed correctly.

I'm reproducing the issue here: https://github.com/charlespnh/beam/actions/runs/13744591726?pr=1. Not sure how to fix this with the cryptic error messages... But I guess we're using Java 11 anyway for development (contributor-docs/code-change-guide.md)?