Prepare release of version 2.3.1 #266

Job	Run time
host_qemu (armv7, gcc)	31m 1s
host_qemu (aarch64, gcc)	26m 53s
host_unix (ubuntu-latest, clang)	3m 7s
host_unix (ubuntu-24.04-arm, clang)	2m 51s
host_unix (macos-latest, gcc)	1m 31s
host_unix (ubuntu-latest, gcc)	2m 48s
host_unix (macos-latest, clang)	1m 56s
host_unix (ubuntu-24.04-arm, gcc)	2m 50s
	1h 12m 57s

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