fix: update lo to slices in eventfilter package

[sanpj2292]

Description

We want to maintain convention of using slices over lo package across the repository

Notion Ticket

https://www.notion.so/rudderstacks/GA4-page-calls-error-is-displaying-in-live-events-tab-for-hybrid-mode-connection-52c58ee1924941f1b037fb8f63fc2445?pvs=4

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 🎉

Comparison is base (bba4894) 51.78% compared to head (a761275) 51.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3238      +/-   ##
==========================================
+ Coverage   51.78%   51.83%   +0.05%     
==========================================
  Files         319      319              
  Lines       53184    53184              
==========================================
+ Hits        27540    27569      +29     
+ Misses      23988    23969      -19     
+ Partials     1656     1646      -10     

Impacted Files	Coverage Δ
processor/eventfilter/eventfilter.go	91.66% <100.00%> (ø)

... and 10 files with indirect coverage changes

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