apps/hubble: fix docker-compose.yml warning (farcasterxyz#2112)

"version is obsolelte"

Docker has made this line obsolete, no need to nention docker compose
version

## Motivation

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## Change Summary

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## Additional Context

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<!-- start pr-codex -->

---

## PR-Codex overview
This PR updates the `docker-compose.yml` file for the `hubble` service
to use version 3.9 and the latest image `farcasterxyz/hubble:latest`.

### Detailed summary
- Updated `docker-compose.yml` to version 3.9
- Changed `hubble` service image to `farcasterxyz/hubble:latest`

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your
question}`

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Signed-off-by: dhairya1008 <[email protected]>
Co-authored-by: dhairya1899 <[email protected]>

apps/hubble/docker-compose.yml

@@ -8,8 +8,6 @@
 #
 #   git fetch --tags --force && git checkout @latest && docker compose up
 
-version: '3.9'
-
 services:
   hubble:
     image: farcasterxyz/hubble:latest