Merge pull request #1505 from SpiNNakerManchester/ssa_forever #4839

Job	Run time
call / validate (ubuntu-latest, 3.12, validate)	4m 6s
call / tests (windows-latest, 3.12, tests)	3m 1s
call / checks (ubuntu-latest, 3.13)	4m 29s
call / tests (windows-2019, 3.9, tests)	2m 43s
call / checks (ubuntu-24.04, 3.11)	3m 14s
call / tests (macos-latest, 3.13, tests)	2m 0s
call / checks (ubuntu-latest, 3.10)	3m 18s
call / tests (macos-13, 3.9, tests)	2m 1s
call / checks (ubuntu-22.04, 3.9)	3m 23s
call / checks (ubuntu-20.04, 3.8)	3m 27s
	31m 42s

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