Relax swisstable density tests to make them future proof for the chan… #86

Job	Run time
Build/Test ubuntu-latest gcc opt	40m 59s
Build/Test ubuntu-latest clang opt	1h 5m 2s
Build/Test arm-ubuntu-arm-22.04-16core clang fastbuild	8m 16s
Build/Test arm-ubuntu-arm-22.04-16core gcc fastbuild	11m 40s
Build/Test ubuntu-latest gcc fastbuild	26m 51s
Build/Test arm-ubuntu-arm-22.04-16core gcc opt	8m 17s
Build/Test arm-ubuntu-arm-22.04-16core clang opt	12m 48s
Build/Test ubuntu-latest clang fastbuild	41m 26s
	3h 35m 19s

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