Bumping version to 2.9.0

[momchil-flex]

Greptile Summary

This PR finalizes version 2.9.0 by removing the release candidate (rc2) suffix from the version number in both tidy3d/version.py and pyproject.toml. This is a standard version bump that promotes 2.9.0rc2 to the stable release 2.9.0, indicating that the release candidate testing phase has been completed successfully.

PR Description Notes:

• No PR description was provided. While this is a straightforward version bump, it would be helpful to include a brief description of the changes and features included in 2.9.0.

Confidence score: 5/5

1. This PR is very safe to merge as it only modifies version strings in version-tracking files.
2. The score is 5/5 because the changes are minimal, strictly version-related, and follow the standard release process.
3. Both changed files (tidy3d/version.py and pyproject.toml) have been updated consistently.

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Diff: origin/develop...HEAD, staged and unstaged changes

• tidy3d/version.py (100%)

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• Coverage: 100%