Upgraded to Spring Boot 3 and EventStoreDB

[oskardudycz]

• Updated to the Spring Boot 3.
• Migrated samples and workshops to EventStoreDB client v4 and EventStoreDB Docker image to 22.10 (the latest LTS).
• Bumped other dependencies.

See more in #38.

---

This discussion was created from the release Upgraded to Spring Boot 3 and EventStoreDB.