fix: export missing picomatch type def from optimizer (fixes #10656)

[timacdonald]

Description

Fixes: #10656 which is also currently failing the Laravel and Svelte Kit builds.

This PR attempts to fix an issue with a missing type definition for Picomatch.

This approach was an attempt to duplicate previous ways of handling this, such as #8352

🚨 I have no idea what I'm doing and this could be completely incorrect.

Additional context

N/A

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).

I think this is covered by the eco-system CI tests...

• Ideally, include relevant tests that fail without this PR but pass with it.