updating htsjdk to 2.18.1 (#5486)
updating htsjdk to 2.18.1 (#5486)

updating htjsdk 2.18.0 -> 2.18.1
this fixes an issue that prevents gatk from reading certain cram files
broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender