Bump immutable from 5.1.4 to 5.1.5 in /copyright-date-block#45

github-actions[bot] merged 1 commit intotrunkwptrainingteam/plugin-developer:trunkfrom

dependabot/npm_and_yarn/copyright-date-block/immutable-5.1.5wptrainingteam/plugin-developer:dependabot/npm_and_yarn/copyright-date-block/immutable-5.1.5Copy head branch name to clipboard