[task]: As Code Owner I would like java code to not rely on deprecated java methods

### Improvement target

Java code statements for which CI build tools report deprecation warnings.

### Improvement description

Review warnings and switch to the long term reliable method calls. It will enable smooth switches to next stable java releases, reduce stress and improve future estimations.

### Observed Version

2.3.1

Check:
- /home/runner/work/bytechef/bytechef/server/libs/modules/components/slack/src/main/java/com/bytechef/component/slack/util/SlackUtils.java
- /home/runner/work/bytechef/bytechef/server/libs/config/async-config/src/main/java/com/bytechef/async/config/AsyncConfiguration.java uses or overrides a deprecated API.
- /home/runner/work/bytechef/bytechef/server/ee/libs/core/discovery/discovery-redis/src/main/java/com/bytechef/ee/discovery/redis/registry/RedisAutoServiceRegistration.java