chore: Bump to 11.9.0

[mfulb]

No description provided.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	8/8 passing
SOAK	❌	81/83 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.12%. Comparing base (2003afb) to head (2543e11).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1054      +/-   ##
==========================================
- Coverage   77.14%   77.12%   -0.02%     
==========================================
  Files         198      198              
  Lines       27991    27971      -20     
==========================================
- Hits        21593    21573      -20     
  Misses       6398     6398              

Flag	Coverage Δ
agent-for-php-7.2	77.45% <ø> (ø)
agent-for-php-7.3	77.47% <ø> (ø)
agent-for-php-7.4	77.19% <ø> (ø)
agent-for-php-8.0	76.58% <ø> (ø)
agent-for-php-8.1	76.90% <ø> (ø)
agent-for-php-8.2	76.51% <ø> (ø)
agent-for-php-8.3	76.51% <ø> (ø)
agent-for-php-8.4	?

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