Update to Java 11 in Dockerfile of CLI

**Description**

Now we cannot run CLI that's in image `utbot_java_cli` on _GitHub Packages_ as the CLI was built with **Java 11** but the image tries to run CLI with **Java 8**.

**Expected behavior**

Dockerfile of Java CLI is based on **Java 11**.

**Environment**

GitHub Actions, GitHub Packages

**Potential alternatives**

No alternatives.

**Context**

Not applicable.