Updated keycloak git tag

Package Merge Request

Package Changes

Enable mTLS metrics scraping
https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/blob/18.2.1-bb.5/CHANGELOG.md

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/90

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/issues/73