fix: suppress `this-escape` warning introduced in JDK 21. #856

Job	Run time
cpp-lib-build (macos-11, clang, ON)	5m 45s
cpp-lib-build (macos-11, clang, OFF)	9m 7s
cpp-lib-build (macos-11, gcc, ON)	5m 57s
cpp-lib-build (macos-11, gcc, OFF)	9m 25s
cpp-lib-build (ubuntu-20.04, clang, ON)	5m 11s
cpp-lib-build (ubuntu-20.04, clang, OFF)	5m 28s
cpp-lib-build (ubuntu-20.04, gcc, ON)	5m 9s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	8m 5s
cpp-lib-build (windows-2022, clang, ON)	7m 43s
cpp-lib-build (windows-2022, clang, OFF)	10m 41s
cpp-lib-build (windows-2022, cl)	7m 31s
build (macos-11, tool)	1s
build (macos-11, cpp)	6m 39s
build (macos-11, csharp)	5m 29s
build (macos-11, dart)	3m 12s
build (macos-11, go)	5m 2s
build (macos-11, java)	2m 31s
build (macos-11, javascript)	12s
build (macos-11, typescript)	1s
build (macos-11, php)	1s
build (macos-11, python3)	1s
build (ubuntu-20.04, tool)	1m 47s
build (ubuntu-20.04, cpp)	12m 53s
build (ubuntu-20.04, csharp)	9m 22s
build (ubuntu-20.04, dart)	6m 25s
build (ubuntu-20.04, go)	4m 16s
build (ubuntu-20.04, java)	1m 39s
build (ubuntu-20.04, javascript)	2m 47s
build (ubuntu-20.04, typescript)	11m 21s
build (ubuntu-20.04, php)	2m 24s
build (ubuntu-20.04, python3)	1m 37s
build (windows-2022, tool)	2m 30s
build (windows-2022, cpp)	10m 48s
build (windows-2022, csharp)	8m 39s
build (windows-2022, dart)	7m 15s
build (windows-2022, go)	8m 13s
build (windows-2022, java)	3m 25s
build (windows-2022, javascript)	5m 10s
build (windows-2022, typescript)	5m 16s
build (windows-2022, php)	6m 17s
build (windows-2022, python3)	3m 15s
	3h 38m 30s

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