Update Biopython docs URL

[victorlin]

Description of proposed changes

The old URL started returning 404 for objects.inv. I took some quick guesses and found another URL that works.

Related issue(s)

• Fixes #1498

Checklist

• [x] PR docs build is successful
• [x] ~If making user-facing changes, add a message in CHANGES.md summarizing the changes in this PR~

[joverlee521]

Nice guess work 🔮