gazelle: set min rules_python version as 1.4

[rickeylev]

rules_python 1.4 is when the python.defaults tag class was introduced, which is used in the example's module file.

Fixes BCR presubmit failures in bazelbuild/bazel-central-registry#6330 and bazelbuild/bazel-central-registry#6241

[gemini-code-assist]

Summary of Changes

Hello @rickeylev, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the "rules_python" dependency to version "1.4.0" within an example "MODULE.bazel" file. This ensures compatibility with features like the "python.defaults" tag class, which was introduced in "rules_python" "1.4", and resolves existing presubmit failures in the Bazel Central Registry, thereby improving the stability and correctness of the build system examples.

Highlights

• Dependency Update: The "rules_python" dependency in the "MODULE.bazel" example file has been updated from version "1.0.0" to "1.4.0".
• Compatibility Fix: This update is crucial as "rules_python" version "1.4" introduced the "python.defaults" tag class, which is utilized within the example's module file.
• Presubmit Failure Resolution: The change directly addresses and resolves presubmit failures observed in the Bazel Central Registry.

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[gemini-code-assist]

Code Review

This pull request correctly updates the minimum version of rules_python to 1.4.0 in the example MODULE.bazel file. This change is necessary because the example uses the python.defaults tag class, which was introduced in rules_python version 1.4. The fix is straightforward, well-justified, and addresses the presubmit failures mentioned in the description. The change looks good.