Update http-concat to include PHP 8.0+ fixes

[rebeccahum]

Description

Pulls in Automattic/nginx-http-concat#72

Changelog Description

Plugin Updated: http-concat

We upgraded http-concat to include the PHP 8.1 fix Automattic/nginx-http-concat#72

Pre-review checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally (or has an appropriate fallback).
• This change works and has been tested on a Go sandbox.
• This change has relevant unit tests (if applicable).
• This change uses a rollout method to ease with deployment (if applicable - especially for large scale actions that require writes).
• This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Pre-deploy checklist

• VIP staff: Ensure any alerts added/updated conform to internal standards (see internal documentation).

[codecov]

Codecov Report

Merging #4919 (2722c42) into develop (280f1c3) will increase coverage by 0.04%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #4919      +/-   ##
=============================================
+ Coverage      29.12%   29.17%   +0.04%     
  Complexity      4744     4744              
=============================================
  Files            278      278              
  Lines          20887    20887              
=============================================
+ Hits            6083     6093      +10     
+ Misses         14804    14794      -10     

see 7 files with indirect coverage changes