ci: Build on Java 11 and Java 8

[saig0]

Description

We need to run the build and tests for both Java versions to ensure the compatibility with other products.

Resources:

• https://github.com/actions/setup-java#install-multiple-jdks
• https://github.com/actions/setup-java/blob/main/docs/advanced-usage.md#testing-against-different-java-distributions

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