[about_py.md] Update np.random → Generator API

[Chihiro2000GitHub]

Summary

Migrate lectures/about_py.md to the NumPy Generator API as part of QuantEcon/meta#299.

• Replace np.random.seed(1234) with rng = np.random.default_rng(1234) and update the two np.random.uniform calls to rng.uniform in the NetworkX graph example.
• The fixed seed is preserved because the original lecture already used one.
• No surrounding prose changes were required.
• No Numba-related code is present in this file.

Hi @mmcky and @HumphreyYang, I'd be grateful if you could take a look when you have time.

[github-actions]

🚀 Deployed on https://69feb902e26c17b542c2bfb8--epic-agnesi-957267.netlify.app

[Chihiro2000GitHub]

Hi @jstac, I just used GitHub CLI with Claude for this PR.

It was really nice — it made the workflow much faster, including the PR creation step.
Of course, I carefully reviewed the diff myself to make sure the change was appropriate.

Thank you for teaching me this!

[HumphreyYang]

Many thanks @Chihiro2000GitHub, this looks great to me!

[mmcky]

✅ Translation sync completed (zh-cn)

Target repo: QuantEcon/lecture-python-programming.zh-cn
Translation PR: QuantEcon/lecture-python-programming.zh-cn#64
Files synced (1):

• lectures/about_py.md

[mmcky]

✅ Translation sync completed (fa)

Target repo: QuantEcon/lecture-python-programming.fa
Translation PR: QuantEcon/lecture-python-programming.fa#121
Files synced (1):

• lectures/about_py.md