chore: mark prs/issues as stale #543

Job	Run time
reth (linux/amd64, ubuntu-24.04, jemalloc,asm-keccak,optimism)	20m 30s
reth (linux/arm64, ubuntu-24.04-arm, jemalloc,optimism)	20m 34s
nethermind (linux/arm64, ubuntu-24.04-arm)	3m 24s
geth (linux/amd64, ubuntu-24.04)	3m 47s
nethermind (linux/amd64, ubuntu-24.04)	2m 59s
geth (linux/arm64, ubuntu-24.04-arm)	3m 7s
	54m 21s

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