Update pr-builder.yml bump to actions/cache@v4

[RushanNanayakkara]

Purpose

${Subject}

Related Issue

• Build failing with "Missing download info for actions/cache@v2" product-is#23500

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.76%. Comparing base (1fb3d0c) to head (c1b2ce6).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #180   +/-   ##
=========================================
  Coverage     50.76%   50.76%           
  Complexity     1596     1596           
=========================================
  Files           238      238           
  Lines          9479     9479           
  Branches       1613     1613           
=========================================
  Hits           4812     4812           
  Misses         4020     4020           
  Partials        647      647           

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