chore: update local dev docs for python 3.11 now

[fuziontech]

Changes

We've updated to using python 3.11, let's update the local dev docs to reflect

Checklist

• Words are spelled using American English
• Titles are in sentence case
• Feature names are in sentence case too
• Use relative URLs for internal links
• If I moved a page, I added a redirect in vercel.json
• Remove this template if you're not going to fill it out!

Article checklist

• I've added (at least) 3-5 internal links to this new article
• I've added keywords for this page to the rank tracker in Ahrefs
• I've checked the preview build of the article
• The date on the article is today's date
• I've added this to the relevant "Tutorials and guides" docs page (if applicable)

Useful resources

• The PostHog style guide
• Full list of tags and categories
• List of content components
• PostHog SEO best practices

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog	✅ Ready (Inspect)	Visit Preview	Jun 23, 2024 1:51pm

[aspicer]

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