bugfix(requirement.txt): resolve the crewai dependency issue with pillow

[heefan]

Problem

As developer,
When clone the project and run uv pip install -r requirements.txt and got the following issue,

❯ uv pip install -r requirements.txt
  × No solution found when resolving dependencies:
  ╰─▶ Because crawl4ai==0.6.3 depends on pillow>=10.4,<11.dev0 and only the following versions of crawl4ai are available:
          crawl4ai<=0.6.3
          crawl4ai>0.7.dev0
      we can conclude that crawl4ai>=0.6.3,<0.7.dev0 depends on pillow>=10.4,<11.dev0.
      And because you require pillow>=11.1.0,<11.2.dev0 and crawl4ai>=0.6.3,<0.7.dev0, we can conclude that your requirements are unsatisfiable.

      hint: `crawl4ai` was requested with a pre-release marker (e.g., crawl4ai>0.6.3,<0.7.dev0), but pre-releases weren't enabled (try: `--prerelease=allow`)

The pull request to downgrade the pillow to 10.4.0 to make it work.

[titanism]

please merge this