Bugfix: Broken dependency resolution due to removed python 3.8 support in rules_python

Reproduce the failure with bazel run //:docs, then inspect the score_bazel_tools_python 0.1.3 MODULE.bazel reference at the linked registry URL and the rules_python 1.8.0 changelog. Trace the python_3_8 import and determine the compatible behavior for newer rules_python versions; done means dependency resolution no longer requests the unavailable repository.

When using score_bazel_tools_python 0.1.3 (which references rules_python 1.4.1) in a repository that specifices a version of rules_python >= 1.8.0, this breaks. Due to dependency resolution following "Minimal Version Selection", the newer rules_python version is taken.
That is also the case if a recent score_docs_as_code (>=3.0.0) is referenced, as this itself references rules_python 1.8.3:
https://github.com/eclipse-score/docs-as-code/blob/main/MODULE.bazel#L22

The support of python 3.8 was dropped in rules_python 1.8.0, leading to the failure
https://rules-python.readthedocs.io/en/latest/changelog.html#v1-8-0
I guess that's valid since python 3.8 support from the python core team was stopped in October 2024.

In score_bazel_tools_python there is the implicit assumption that python 3.8 support from rules_python exists.
Either that should be removed or reworked.

Actual error message:

~/score/inc_someip_gateway$ bazel run //:docs
ERROR: module extension @@rules_python+//python/extensions:python.bzl%python does not generate repository "python_3_8", yet it is imported as "bazel_tools_python_python_3_8" in the usage at https://raw.githubusercontent.com/eclipse-score/bazel_registry/main/modules/score_bazel_tools_python/0.1.3/MODULE.bazel:74:23 (did you mean 'python_3_9'?)
INFO: Elapsed time: 0.814s
INFO: 0 processes.
ERROR: Build did NOT complete successfully
ERROR: Build failed. Not running target

[!IMPORTANT]
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