fix: General Event Statistics type

[iamareebjamal]

Fixes #6776

Related fossasia/open-event-frontend#3890

[codecov]

Codecov Report

Merging #6810 into development will decrease coverage by <.01%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #6810      +/-   ##
===============================================
- Coverage        65.28%   65.28%   -0.01%     
===============================================
  Files              302      302              
  Lines            15277    15277              
===============================================
- Hits              9974     9973       -1     
- Misses            5303     5304       +1

Impacted Files	Coverage Δ
app/api/schema/events.py	91.47% <ø> (ø)	⬆️
app/models/event.py	78.09% <0%> (-0.36%)	⬇️

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