Downgrade project to use Java 8 for the build pipeline #257
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Description
This PR downgrades the project's build pipeline to Java 8. Since we target Java 8, to ensure that users on Java 8 can use this library, we need to also run our complete pipeline over Java 8. Unfortunately targeting the language level is not enough as that only guarantees newer language features are not used, but does not guarantee things such as using new standard library functions which are not available in Java 8.
Pull Request Checklist
mvn clean install -DskipTests
locally before committing