Update quay.io/keycloak/keycloak Docker tag to v20.0.5 (#8308)

| datasource | package                   | from   | to     |
| ---------- | ------------------------- | ------ | ------ |
| docker     | quay.io/keycloak/keycloak | 20.0.1 | 20.0.5 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

examples/custom-resources/jwks/keycloak.yaml

@@ -31,7 +31,7 @@ spec:
     spec:
       containers:
       - name: keycloak
-        image: quay.io/keycloak/keycloak:20.0.1
+        image: quay.io/keycloak/keycloak:20.0.5
         args: ["start-dev"]
         env:
         - name: KEYCLOAK_ADMIN