Upgrade htsjdk to 2.11.0-4-g958dc6e-SNAPSHOT.

[cmnbroad]

Picks up VCF header performance fix.

[droazen]

👍 merge once tests pass

[codecov-io]

Codecov Report

Merging #3504 into master will decrease coverage by 0.003%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##              master     #3504       +/-   ##
===============================================
- Coverage     80.176%   80.173%   -0.003%     
- Complexity     17710     17711        +1     
===============================================
  Files           1184      1184               
  Lines          64150     64150               
  Branches        9959      9959               
===============================================
- Hits           51433     51431        -2     
- Misses          8759      8762        +3     
+ Partials        3958      3957        -1

Impacted Files	Coverage Δ	Complexity Δ
...oadinstitute/hellbender/utils/gcs/BucketUtils.java	74.342% <0%> (-1.974%)	38% <0%> (ø)
...er/tools/spark/sv/discovery/AlignmentInterval.java	90.678% <0%> (+0.847%)	24% <0%> (+1%)	⬆️