[Java] Upgrade to Checkstyle 10.21.1. #1219

Job	Run time
C++ Clang 9 (Ubuntu 20.04)	1m 34s
C++ Clang 10 (Ubuntu 20.04)	1m 51s
C++ Clang 11 (Ubuntu 20.04)	2m 15s
C++ Clang 13 (Ubuntu 24.04)	3m 35s
C++ Clang 12 (Ubuntu 20.04)	2m 2s
C++ Xcode (macOS)	1m 2s
C++ Clang 14 (Ubuntu 24.04)	2m 23s
C++ GCC 6 (Ubuntu 20.04)	1m 30s
C++ Clang 15 (Ubuntu 24.04)	1m 25s
C++ GCC 11 (Ubuntu 24.04)	1m 30s
C++ GCC 7 (Ubuntu 20.04)	1m 51s
C++ Clang 16 (Ubuntu 24.04)	1m 17s
C++ GCC 12 (Ubuntu 24.04)	1m 31s
C++ GCC 8 (Ubuntu 20.04)	1m 35s
C++ MSVC (Windows) (windows-latest)	9m 10s
C++ Clang 17 (Ubuntu 24.04)	1m 18s
C++ GCC 13 (Ubuntu 24.04)	1m 22s
C++ GCC 9 (Ubuntu 20.04)	1m 34s
C++ Clang 18 (Ubuntu 24.04)	2m 41s
C++ GCC 10 (Ubuntu 20.04)	1m 33s
C++ GCC 14 (Ubuntu 24.04)	1m 31s
C# 8.0.x	2m 40s
Golang 1.22.x	1m 52s
Java 17 (ubuntu-24.04)	1m 40s
Rust stable	56s
Java 17 (windows-latest)	3m 23s
Rust beta	1m 2s
Java 17 (macos-latest)	1m 25s
Rust nightly	59s
Java 21 (ubuntu-24.04)	1m 35s
Java 21 (windows-latest)	6m 13s
Java 21 (macos-latest)	1m 40s
	1h 7m 55s

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