Minor mistake in release notes

[potiuk]

Small nit:

You have a minor issue in release notes for 3.2.0 - it's mentioned there that you dropped support for Python 3.9, but in fact it was 3.8 that was dropped

Compare https://github.com/pallets-eco/wtforms/releases/tag/3.2.0

With: https://github.com/pallets-eco/wtforms/pull/855/files