[Java] Upgrade to Checkstyle 8.15.
[Java] Upgrade to Checkstyle 8.15.

real-logic/Aeron,mikeb01/Aeron,EvilMcJerkface/Aeron,real-logic/Aeron,galderz/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,galderz/Aeron,real-logic/Aeron,EvilMcJerkface/Aeron,real-logic/Aeron,galderz/Aeron,mikeb01/Aeron,mikeb01/Aeron,galderz/Aeron,EvilMcJerkface/Aeron