Update 1x8c8 4x8c8 with simplified int8 convert #5

Job	Run time
build-and-test / cmake-linux-aarch64	1s
build-and-test / cmake-linux-riscv64-rvv	1s
build-and-test / cmake-linux-armhf	1s
build-and-test / cmake-linux-riscv64	1s
build-and-test / cmake-linux-x86_64	1s
build-and-test / bazel-linux-aarch64	1s
build-and-test / cmake-windows-x64	1s
build-and-test / cmake-windows-arm64	1s
build-and-test / bazel-linux-x86_64-clang-18	1s
build-and-test / bazel-linux-x86_64-gcc-9	1s
build-and-test / cmake-android (arm64)	1s
build-and-test / cmake-ios-arm64	6m 47s
build-and-test / cmake-ios-x86_64	7m 50s
build-and-test / cmake-android (armv7)	1s
build-and-test / cmake-macos-arm64	3m 59s
build-and-test / cmake-android (x86)	1s
build-and-test / cmake-windows-x86	1s
	18m 50s

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