Merge pull request #586 from SpiNNakerManchester/fix_shared_sdram #1883

Job	Run time
call / validate (ubuntu-latest, 3.12, validate)	2m 22s
call / tests (windows-latest, 3.12, tests)	1m 57s
call / tests (windows-2019, 3.9, tests)	2m 6s
call / checks (ubuntu-latest, 3.13)	2m 8s
call / tests (macos-latest, 3.13, tests)	1m 7s
call / checks (ubuntu-24.04, 3.11)	1m 43s
call / tests (macos-13, 3.9, tests)	2m 38s
call / checks (ubuntu-latest, 3.10)	2m 8s
call / checks (ubuntu-22.04, 3.9)	2m 3s
call / checks (ubuntu-20.04, 3.8)	2m 44s
	20m 56s

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