chore: Change agbenchmark to directory dependency in autogpt and forge

[Pwuts]

Poetry recently released a new version containing a fix for the issue we were having earlier:
python-poetry/poetry#8548

This means unavailable optional directory dependencies should no longer break the docker build.

Using directory dependencies has the advantage that we don't have to manually chore: Update 'agbenchmark' dependency for agent and forge (see commit history), because they'll always import the package directly from the folder in the local repo.

Changes 🏗️

• Change agbenchmark dependency in forge/pyproject.toml to a directory dependency
  • Update poetry.lock
• Change agbenchmark dependency in autogpt/pyproject.toml to a directory dependency
  • Update poetry.lock

PR Quality Scorecard ✨

• Have you used the PR description template?   +2 pts
• Is your pull request atomic, focusing on a single change?   +5 pts
• Have you linked the GitHub issue(s) that this PR addresses?   +5 pts
• Have you documented your changes clearly and comprehensively?   +5 pts
• Have you changed or added a feature?   -4 pts
  • Have you added/updated corresponding documentation?   +4 pts
  • Have you added/updated corresponding integration tests?   +5 pts
• Have you changed the behavior of AutoGPT?   -5 pts
  • Have you also run agbenchmark to verify that these changes do not regress performance?   +10 pts

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.11%. Comparing base (2c96f61) to head (e87af55).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6946   +/-   ##
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  Coverage   45.11%   45.11%           
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  Files         140      140           
  Lines        6408     6408           
  Branches      897      897           
=======================================
  Hits         2891     2891           
  Misses       3368     3368           
  Partials      149      149           

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