align gcc version with curl's CI

[samuel40791765]

Description of changes:

Curl's tip of main is failing against a compiler warning specific to gcc-12 at the moment with -Werror enabled. This is causing errors in our integration CI. We enable the flag since Curl's CI enables it, but they run against gcc-11 for their CI.

I've submitted an issue to curl to fix it (curl/curl#13932), but we should use gcc-11 for our Curl CI to avoid with curl's main branch that are out of our control.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.14%. Comparing base (37ba0e2) to head (70d9bc8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1633      +/-   ##
==========================================
- Coverage   78.15%   78.14%   -0.02%     
==========================================
  Files         562      562              
  Lines       94638    94638              
  Branches    13573    13573              
==========================================
- Hits        73969    73952      -17     
- Misses      20075    20093      +18     
+ Partials      594      593       -1     

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