Bump fonttools in /docs/notebooks/transfer_learning (#2874)

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.59.0 to 4.60.2.
- [Release notes](https://github.com/fonttools/fonttools/releases)
- [Changelog](https://github.com/fonttools/fonttools/blob/main/NEWS.rst)
- [Commits](fonttools/fonttools@4.59.0...4.60.2)

---
updated-dependencies:
- dependency-name: fonttools
  dependency-version: 4.60.2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Clayne Robison <[email protected]>

Author: dependabot[bot]