OKAPI-970: testcontainers 1.15.1 needed for latest docker
OKAPI-970: testcontainers 1.15.1 needed for latest docker

Upgrade testcontainers from 1.15.0 to 1.15.1 to make it work with latest docker
Release notes: https://github.com/testcontainers/testcontainers-java/releases/tag/1.15.1

Without this upgrade unit tests that use testcontainers no longer work.

folio-org/okapi,folio-org/okapi