Security fix - Wagtail 2.15.2 released

[Matthew Westcott]

Hi all,
Wagtail 2.15.2 is now available, to fix an information disclosure issue with severity "low", along with various other bug fixes.

For full details please see the release notes at https://docs.wagtail.io/en/stable/releases/2.15.2.html, and the security advisory at https://github.com/wagtail/wagtail/security/advisories/GHSA-xqxm-2rpm-3889.

For general upgrading instructions, please see: https://docs.wagtail.io/en/stable/releases/upgrading.html

Cheers,
- Matt