The workflow build.yml is referencing action gradle/wrapper-validation-action using references v1. However this reference is missing the commit 89eda1fdc0167f59521d2bb10767f7169fb4d018 which may contain fix to the some vulnerability.
The vulnerability fix that is missing by actions version could be related to:
(1) CVE fix
(2) upgrade of vulnerable dependency
(3) fix to secret leak and others.
Please consider to update the reference to the action.