fix: ensure created_at shows up in json

[jmeridth]

Additional fixes for #489

• Handle json output of created_at
• update git version installed in image

Pull Request

Proposed Changes

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• run make lint and fix any issues that you have introduced
• run make test and ensure you have test coverage for the lines you are introducing
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[Copilot]

Pull Request Overview

This PR ensures that the created_at attribute is included in the JSON output for issues. The changes update both the JSON writer function and its corresponding tests.

• Added the created_at field to the JSON output in json_writer.py.
• Updated test_json_writer.py to include created_at in input test cases and expected outputs.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test_json_writer.py	Added created_at parameter in issue objects and expected JSON.
json_writer.py	Updated JSON output to include the created_at field.

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