Merge pull request #407 from SpiNNakerManchester/spalloc_without_user… #1400

Job	Run time
call / validate (ubuntu-latest, 3.12, validate)	3m 10s
call / tests (windows-latest, 3.12, tests)	2m 16s
call / tests (windows-2019, 3.8, tests)	2m 34s
call / tests (macos-latest, 3.12, tests)	2m 8s
call / checks (ubuntu-latest, 3.13)	2s
call / tests (macos-11, 3.8, tests)	2m 4s
call / checks (ubuntu-24.04, 3.11)	2m 11s
call / checks (ubuntu-latest, 3.10)	2m 37s
call / checks (ubuntu-22.04, 3.9)	2m 27s
call / checks (ubuntu-20.04, 3.8)	2m 22s
	21m 51s

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