Problem: memory leak in versiondb (backport: #1491)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.52%. Comparing base (90e7c58) to head (e120983).

Additional details and impacted files

@@               Coverage Diff               @@
##           release/v1.2.x    #1492   +/-   ##
===============================================
  Coverage           36.51%   36.52%           
===============================================
  Files                 129      129           
  Lines                9606     9607    +1     
===============================================
+ Hits                 3508     3509    +1     
  Misses               5721     5721           
  Partials              377      377           

Files	Coverage Δ
versiondb/tsrocksdb/store.go	54.36% <100.00%> (+0.30%)	⬆️