adjust readme to new version

Signed-off-by: Niko Köbler <niko@n-k.de>

README.md

@@ -8,7 +8,7 @@ A [Testcontainers](https://www.testcontainers.org/) implementation for [Keycloak
 ![Github Last Commit](https://img.shields.io/github/last-commit/dasniko/testcontainers-keycloak)
 ![License](https://img.shields.io/github/license/dasniko/testcontainers-keycloak?label=License)
 
-[![Keycloak Version](https://img.shields.io/badge/Keycloak-26.0-blue)](https://www.keycloak.org)
+[![Keycloak Version](https://img.shields.io/badge/Keycloak-26.1-blue)](https://www.keycloak.org)
 ![Java Version](https://img.shields.io/badge/Java-17-f89820)
 [![GitHub Stars](https://img.shields.io/github/stars/dasniko/testcontainers-keycloak)](https://github.com/dasniko/testcontainers-keycloak/stargazers)
 [![CI build](https://github.com/dasniko/testcontainers-keycloak/actions/workflows/maven.yml/badge.svg)](https://github.com/dasniko/testcontainers-keycloak/actions/workflows/maven.yml)
@@ -39,7 +39,7 @@ Use another Keycloak Docker image/version than used in this Testcontainer:
 
 ```java
 @Container
-KeycloakContainer keycloak = new KeycloakContainer("quay.io/keycloak/keycloak:26.0");
+KeycloakContainer keycloak = new KeycloakContainer("quay.io/keycloak/keycloak:26.1");
 ```
 
 ### Initial admin user credentials
@@ -395,6 +395,7 @@ For Keycloak versions until 21.x, see [version 2.x branch](https://github.com/da
 | 3.3.x                   | 1.19.6         | 24.0     |
 | 3.4.x                   | 1.19.8         | 25.0     |
 | 3.5.x                   | 1.20.2         | 26.0     |
+| 3.6.x                   | 1.20.4         | 26.1     |
 
 _There might also be other possible version configurations which will work._
 
@@ -413,6 +414,6 @@ Kudos to [@thomasdarimont](https://github.com/thomasdarimont) for some inspirati
 
 Apache License 2.0
 
-Copyright (c) 2019-2024 Niko Köbler
+Copyright (c) 2019-2025 Niko Köbler
 
 See [LICENSE](LICENSE) file for details.