Add back nightly testing of blst dependency #742

Job	Run time
Build and Test on macos-latest CPython 3.7	9m 9s
Build and Test on macos-latest CPython 3.8	9m 54s
Build and Test on macos-latest CPython 3.9	10m 51s
Build and Test on macos-latest CPython 3.10	12m 0s
Build and Test on macos-latest CPython 3.11	11m 46s
Build and Test on ubuntu-latest CPython 3.7	6m 37s
Build and Test on ubuntu-latest CPython 3.8	9m 42s
Build and Test on ubuntu-latest CPython 3.9	6m 43s
Build and Test on ubuntu-latest CPython 3.10	10m 20s
Build and Test on ubuntu-latest CPython 3.11	6m 15s
Build and Test on windows-latest CPython 3.7	7m 36s
Build and Test on windows-latest CPython 3.8	6m 30s
Build and Test on windows-latest CPython 3.9	6m 0s
Build and Test on windows-latest CPython 3.10	6m 24s
Build and Test on windows-latest CPython 3.11	6m 44s
coverage	1m 17s
	2h 7m 48s

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