memcache - upgrading buffer to 6.0.3

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
memcache - upgrading buffer to 6.0.3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.93%. Comparing base (35191a2) to head (bbbf13f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1068   +/-   ##
=======================================
  Coverage   99.93%   99.93%           
=======================================
  Files          40       40           
  Lines        2970     2970           
  Branches      522      522           
=======================================
  Hits         2968     2968           
  Misses          2        2           

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