Fix DateParserTest unit tests that were failing in my locale.

[Lenbok]

Description

Several of the DateParserTest unit tests were failing in my locale due to their use of the deprecated Date.parse() method. It seems to me that the existing steps of Date.parse(date.toString()) weren't really accomplishing anything related to htsjdk code (perhaps it was required in past JREs in order to get unix timestamps), so have simplified the assertion to just compare the time stamps directly.

Checklist

• Code compiles correctly
• All tests passing

[codecov-io]

Codecov Report

Merging #832 into master will increase coverage by 0.009%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##              master      #832       +/-   ##
===============================================
+ Coverage     64.864%   64.874%   +0.009%     
- Complexity      7195      7196        +1     
===============================================
  Files            527       527               
  Lines          31774     31774               
  Branches        5424      5424               
===============================================
+ Hits           20610     20613        +3     
+ Misses          9016      9014        -2     
+ Partials        2148      2147        -1

Impacted Files	Coverage Δ	Complexity Δ
...samtools/util/AsyncBlockCompressedInputStream.java	76% <0%> (+4%)	13% <0%> (+1%)	⬆️

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[droazen]

👍