Turn on concurrent set deletions in sweep thread #9586

Job	Run time
make (test-bundled-gems, --enable-yjit=dev)	25m 19s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	4m 18s
cargo clippy	40s
cargo test	1m 36s
make (check, --enable-yjit=dev)	6m 35s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-14 --enable-yjit=dev --enable-zji...	4m 22s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	6m 7s
YJIT Ubuntu result	3s
	49m 0s

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