fix: update uproot version for file writing fix

[alexander-held]

uproot version 4.1.5 fixes another bug with file writing. This expands on #299 to now set the minimum required version of uproot to 4.1.5.

* updated uproot version to 4.1.5 for robust file writing

[codecov]

Codecov Report

Merging #300 (fbc0c3e) into master (1bfeb80) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #300   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         1878      1878           
  Branches       295       295           
=========================================
  Hits          1878      1878           

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