Update keycloak/keycloak Docker tag to v26.0.7 (#1856)

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

Author: renovate[bot]

src/test/java/plugins/OicAuthPluginTest.java

@@ -45,7 +45,7 @@ public class OicAuthPluginTest extends AbstractJUnitTest {
     private static final String CLIENT = "jenkins";
 
     private static final String KEYCLOAK_IMAGE =
-            "keycloak/keycloak:26.0.6@sha256:a93d22e13b8641c683b7d5ccf6802a8ee177a21357ab7950228c7517ad1896c0";
+            "keycloak/keycloak:26.0.7@sha256:4388e2379b7e870a447adbe7b80bd61f5fbf04e925832b19669fda4957f05a81";
 
     @Rule
     public KeycloakContainer keycloak = new KeycloakContainer(KEYCLOAK_IMAGE);