XSLT preprocessing memory leak: https://github.com/metanorma/isodoc/i…

[opoudjis]

…ssues/546

Metanorma PR checklist

• Breaking changes (list related PRs)
• Documentation update required (create task for this)
• External dependency introduced (documentation update need)
• Gem with native library introduced

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d5df72d) 95.33% compared to head (bfe93c9) 95.33%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #547   +/-   ##
=======================================
  Coverage   95.33%   95.33%           
=======================================
  Files          77       77           
  Lines        5332     5334    +2     
=======================================
+ Hits         5083     5085    +2     
  Misses        249      249           

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