Remove ocramius/proxy-manager package

[Jeckerson]

Hello!

• Type: code quality
• Link to issue: related PHP 8.1 support #2255

In raising this pull request, I confirm the following:

• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I updated the CHANGELOG

Small description of change:

Thanks

[codecov]

Codecov Report

Merging #2268 (234514c) into development (b3eb0cd) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             development   #2268   +/-   ##
=============================================
  Coverage           7.80%   7.80%           
  Complexity          8604    8604           
=============================================
  Files                356     356           
  Lines              21710   21710           
=============================================
  Hits                1694    1694           
  Misses             20016   20016