Keycloak: Fix mTLS metrics bug

Package Merge Request

Package Changes

https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/blob/18.2.1-bb.3/CHANGELOG.md

Issue found during release testing.

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/83