Enable multi threaded test in CI #1025

Job	Run time
ios	1m 22s
earthly (bookworm)	1m 51s
android (armeabi-v7a)	51s
linux	1m 13s
android (arm64-v8a)	56s
linux-386	1m 28s
linux-arm	1m 11s
android (x86)	1m 2s
android (x86_64)	44s
linux-arm64	1m 0s
linux-arm-no-pqc	1m 17s
linux-multithread	1m 12s
linux-riscv64	1m 10s
macos	3m 19s
macos_arm64	1m 20s
tvos	1m 4s
windows (windows_64, x64)	3m 0s
windows (windows_64_multithread, x64)	1m 32s
windows (windows_32, x86)	1m 57s
windows (windows_arm64, amd64_arm64)	1m 44s
	29m 13s

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