lint

veristat-scx: unpin sched-ext revision back to main branch #816

Job	Run time
Lint	7s
ShellCheck	4s
Unittests	4s
Validate matrix.py (kernel-patches, bpf)	4s
Validate matrix.py (foo, bar)	7s
Validate matrix.py (foo, bpf)	6s
Validate matrix.py (foo, vmtest)	4s
Validate matrix.py (kernel-patches, vmtest)	5s
Validate matrix.py (kernel-patches, bar)	4s
	45s

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