Fixing Typo in UPGRADE.md

[DSTester]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.90%. Comparing base (fe63447) to head (93f8a6f).
Report is 53 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #742      +/-   ##
============================================
- Coverage     94.40%   93.90%   -0.50%     
- Complexity      953     1013      +60     
============================================
  Files           108      120      +12     
  Lines          3018     3201     +183     
============================================
+ Hits           2849     3006     +157     
- Misses          169      195      +26     

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[vjik]

Thanks 👍