clarify minimum required Java Version 6 or 8

[Simulant87]

It is a little bit unclear to me, which should be the minimum required Java version for this project. I would like to get clarity on it.

#815 brings back the Java 1.6 build pipeline check after it was removed by #741

In the readme is says:

Designed and tested to use on Java versions 1.6 - 21

In the FAQ is says:

At the present time Java 8 is required, in order to support pre-existing Java users that are still on 8. It was decided that Android users are probably no longer tied to Java 6. The last release to support Java 6 is 20230618.

In the maven and gradle build files it specifies Java 1.8

I recommend that all stated references should define the same minimum version.

If Java 8 should be the minimum, I submitted these 2 PRs:
#914
#913

If Java 1.6 should still be the minimum, please close the PRs, update the FAQ and the build definition.

[stleary]

@Simulant87 The Wiki page was not correct. Although the code requires Java 8 for unit testing, and the build automation uses Java 8, the source code remains compatible with Java 6. For example, a developer who needs Java6 for an embedded system or an old Android phone can still compile and execute the library. There are no plans to remove support at this time.

I have corrected the text in What version of Java does this project require?. Thanks for letting me know.

[Simulant87]

Thank you for the quick response and update in the FAQ. I closed my PRs.