Old formatter releases aren't selectable #44

The action can only access the last 30 formatter releases, because Github API "list" results default to 30-length pages.

Right now, that cuts off at release version 1.11.0, which runs on Java 11+, so the action can't run on Java 8.

There are currently 42 releases, so taking the longest page allowed would cover them all:

• https://api.github.com/repos/google/google-java-format/releases?per_page=100
• vs https://api.github.com/repos/google/google-java-format/releases