docs: fix typo in community_modules.md

[rjw57]

The required feature for postgres support is "postgres" and not "posrges".

[netlify[bot]]

✅ Deploy Preview for testcontainers-rust ready!

Name	Link
🔨 Latest commit	4b9a38317e21b5c382d79f5fc126e2c6b09d4ab5
🔍 Latest deploy log	https://app.netlify.com/sites/testcontainers-rust/deploys/66c9a8fa50358f00081d351c
😎 Deploy Preview	https://deploy-preview-723--testcontainers-rust.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[DDtKey]

Thank you!