refactor(reth/dockerfile): Reference tag instead of branch #271

Job	Run time
geth (linux/amd64, ubuntu-24.04)	3m 17s
geth (linux/arm64, ubuntu-24.04-arm)	3m 7s
nethermind (linux/amd64, ubuntu-24.04)	2m 38s
reth (linux/amd64, ubuntu-24.04, jemalloc,asm-keccak,optimism)	26m 46s
reth (linux/arm64, ubuntu-24.04-arm, jemalloc,optimism)	29m 23s
nethermind (linux/arm64, ubuntu-24.04-arm)	2m 51s
	1h 8m 2s

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