remove testset from a test in boundscheck_exec.jl

[KristofferC]

otherwise, this prints testset status to the console when running the base tests

Can be seen in e.g. https://build.julialang.org/#/builders/65/builds/3404/steps/5/logs/stdio

      From worker 9:	Test Summary:                                               | Pass  Total
      From worker 9:	pass inbounds meta to getindex on CartesianIndices (#42115) |    2      2
      From worker 9:	Test Summary:                                               | Pass  Total
      From worker 9:	pass inbounds meta to getindex on CartesianIndices (#42115) |    2      2
      From worker 9:	Test Summary:                                               | Pass  Total
      From worker 9:	pass inbounds meta to getindex on CartesianIndices (#42115) |    2      2

[timholy]

Can't you just add nothing to the end of the file?

[KristofferC]

Fixed by #44444