update brew install libevent in CI workflow #1007

Job	Run time
prepare-static-dependencies	37s
prepare	16s
build-macos (macos-26-intel-cross-compile-static-link)	2m 49s
build-macos (macos-26-arm)	1m 49s
build-linux (ubuntu-22)	2m 25s
build-windows (windows-x64-avx2)	4m 6s
build-linux (ubuntu-24)	1m 50s
build-windows (windows-x86-sse2)	3m 35s
build-windows (windows-x64-no-simd)	3m 37s
build-macos (macos-15-intel)	2m 54s
build-linux (ubuntu-arm-static-link)	2m 39s
build-linux (ubuntu-static-link)	2m 58s
build-windows (windows-2025)	4m 9s
build-macos (macos-26-arm-static-link)	1m 41s
build-windows (windows-arm64)	3m 51s
	39m 16s

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