Build step fails in CI pipeline

[Gavril Tonev]

Describe the bug
Currently the build step in the CI.yml file fails due to issues with Java 11 target version.

To Reproduce
Steps to reproduce the behavior:

1. Push to development or create a PR
2. Click on Actions and select the build step
3. See error

Expected behavior
CI pipeline builds and tests the project successfully.

Screenshots
N/A

Additional context
N/A