Use late static bindings to support overriding data collections file finding

[caendesilva]

Fixes #1716 by calling static instead of the class self reference.

This fix can be released in a patch release since protected methods are generally not supported by our BC promise.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (00943e3) to head (5b01fe4).
Report is 4 commits behind head on master.

❗ Current head 5b01fe4 differs from pull request most recent head 38f938c

Please upload reports for the commit 38f938c to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1717   +/-   ##
=========================================
  Coverage     99.97%   99.97%           
  Complexity     1745     1745           
=========================================
  Files           181      181           
  Lines          4661     4661           
=========================================
  Hits           4660     4660           
  Misses            1        1           

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