Remove secp256k1 benchmark (#481) #264

Job	Run time
linux-x86-deny	50s
linux-native-ci-asm (ubuntu-latest)	47s
linux-native-ci-asm (ubuntu-24.04-arm)	1m 40s
linux-x86-ci (ubuntu-latest)	49s
linux-x86-ci (ubuntu-24.04-arm)	2m 0s
linux-x86-ci-generated	12s
linux-native-test-suite (ubuntu-latest)	3m 8s
windows-x86-ci-asm	3m 48s
linux-native-test-spawn (ubuntu-latest)	47s
linux-native-test-spawn (ubuntu-24.04-arm)	2m 13s
linux-fuzz	4m 31s
linux-arm-test-suite	6m 0s
linux-native-ci-asm-chaos (ubuntu-latest)	59s
linux-native-test-suite (ubuntu-24.04-arm)	4m 45s
linux-arm-ci-asm	6m 36s
macos-x86-ci-asm	1m 39s
linux-native-ci-asm-chaos (ubuntu-24.04-arm)	1m 39s
	42m 23s

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