(fleet/keycloak) change image repo to bitnamilegacy/keycloak

The image we were using has been migrated from bitnami/keycloak ->
bitnamilegacy/keycloak:

     ~ $ docker pull docker.io/bitnami/keycloak:22.0.5-debian-11-r4
    Trying to pull docker.io/bitnami/keycloak:22.0.5-debian-11-r4...
    Error: unable to copy from source docker://bitnami/keycloak:22.0.5-debian-11-r4: initializing source docker://bitnami/keycloak:22.0.5-debian-11-r4: reading manifest 22.0.5-debian-11-r4 in docker.io/bitnami/keycloak: manifest unknown
     ~ $ docker pull docker.io/bitnamilegacy/keycloak:22.0.5-debian-11-r4
    Trying to pull docker.io/bitnamilegacy/keycloak:22.0.5-debian-11-r4...
    Getting image source signatures
    Copying blob 45d15cadab28 skipped: already exists
    Copying config 3a7b1ea1c5 done   |
    Writing manifest to image destination
    3a7b1ea1c5dd5995e9d553bb9c94c08bb4d4cf5296c79bab861ec14296bc208b

Author: jhoblitt

fleet/lib/keycloak/values.yaml

@@ -1,4 +1,6 @@
 ---
+image:
+  repository: bitnamilegacy/keycloak
 replicaCount: 3
 resources:
   limits: