Update CODEOWNERS

[ntindle]

Background

For the rearch, we shouldn't allow unsolicited commits to be merged without James's knowledge.

Changes

Adds James as a code owner of the core

Documentation

N/A, just adds him to all prs targeting core

Test Plan

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes.
• I have run the following commands against my code to ensure it passes our linters:

  black .
  isort .
  mypy
  autoflake --remove-all-unused-imports --recursive --ignore-init-module-imports --ignore-pass-after-docstring autogpt tests --in-place

[netlify]

✅ Deploy Preview for auto-gpt-docs canceled.

Name	Link
🔨 Latest commit	a278c4a
🔍 Latest deploy log	https://app.netlify.com/sites/auto-gpt-docs/deploys/64a44de9f2ac97000856b6c3

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5070cc3) 70.62% compared to head (a278c4a) 70.62%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4884   +/-   ##
=======================================
  Coverage   70.62%   70.62%           
=======================================
  Files          69       69           
  Lines        3387     3387           
  Branches      554      554           
=======================================
  Hits         2392     2392           
  Misses        811      811           
  Partials      184      184           

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