Allow None for JDBC password

[kellen]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (5778aa2) 63.17% compared to head (2bf3ee6) 63.17%.

❗ Current head 2bf3ee6 differs from pull request most recent head fa39163. Consider uploading reports for the commit fa39163 to get more accurate results

Files	Patch %	Lines
...cala/com/spotify/scio/jdbc/sharded/JdbcUtils.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5081   +/-   ##
=======================================
  Coverage   63.17%   63.17%           
=======================================
  Files         286      286           
  Lines       10785    10785           
  Branches      791      791           
=======================================
  Hits         6813     6813           
  Misses       3972     3972           

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[RustedBones]

Thank you!