Remove obsolete version attribute from docker-compose.yml files

[Copilot]

Summary

Removes the obsolete version attribute from both docker-compose.yml files to eliminate the warning message generated by Docker Compose v2.

Problem

Docker Compose v2 deprecated the top-level version attribute, and now shows a warning when it's present:

WARN[0000] /Users/smujahid/repos/mozilla/bugbug/http_service/docker-compose.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion

Solution

Removed version: "3.2" from:

• docker-compose.yml
• http_service/docker-compose.yml

Docker Compose automatically determines the appropriate compose specification version based on the features used in the file, making this attribute unnecessary.

Validation

• ✅ YAML syntax validated with pre-commit hooks
• ✅ Docker Compose configuration validated with docker compose config
• ✅ Confirmed warning no longer appears
• ✅ No functional changes to the compose configurations

This change aligns with current Docker Compose best practices and removes potential confusion for developers working with the project.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>The version attribute in docker-compose.yml is obsolete</issue_title>
<issue_description>```
WARN[0000] /Users/smujahid/repos/mozilla/bugbug/http_service/docker-compose.yml: the attribute version is obsolete, it will be ignored, please remove it to avoid potential confusion

<agent_instructions>Remove the version.</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

Fixes #5368

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