Merge JoinMarket-Org/joinmarket-clientserver#1720: CI: Bump Bitcoin C… #528

Job	Run time
python 3.8, bitcoind 0.18.0 on macos-13	17m 56s
python 3.8, bitcoind 27.1 on macos-13	20m 56s
python 3.12, bitcoind 0.18.0 on macos-13	20m 3s
python 3.12, bitcoind 27.1 on macos-13	20m 53s
python 3.8, bitcoind 0.18.0 on ubuntu-latest	11m 47s
python 3.8, bitcoind 27.1 on ubuntu-latest	10m 31s
python 3.12, bitcoind 0.18.0 on ubuntu-latest	11m 37s
python 3.12, bitcoind 27.1 on ubuntu-latest	12m 29s
	2h 6m 12s

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