Allow multiple files to be passed to linkml-sqldb dump

[cmungall]

Fixes #1984

[codecov]

Codecov Report

Attention: Patch coverage is 7.14286% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 80.73%. Comparing base (16f4e62) to head (3243363).

Files	Patch %	Lines
linkml/utils/sqlutils.py	7.14%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1985      +/-   ##
==========================================
- Coverage   80.76%   80.73%   -0.04%     
==========================================
  Files         104      104              
  Lines       11590    11596       +6     
  Branches     2899     2902       +3     
==========================================
+ Hits         9361     9362       +1     
- Misses       1691     1696       +5     
  Partials      538      538              

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