chore(agent): Bump version to 11.6

[hahuja2]

No description provided.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	❌	0/8 passing
SOAK	✅	72/72 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.04%. Comparing base (5b320e8) to head (6da20d4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1008   +/-   ##
=======================================
  Coverage   78.04%   78.04%           
=======================================
  Files         196      196           
  Lines       27105    27105           
=======================================
  Hits        21155    21155           
  Misses       5950     5950           

Flag	Coverage Δ
agent-for-php-7.2	78.04% <ø> (ø)
agent-for-php-7.3	78.05% <ø> (ø)
agent-for-php-7.4	77.76% <ø> (ø)
agent-for-php-8.0	77.13% <ø> (ø)
agent-for-php-8.1	77.79% <ø> (ø)
agent-for-php-8.2	77.38% <ø> (ø)
agent-for-php-8.3	77.38% <ø> (ø)
agent-for-php-8.4	77.40% <ø> (ø)

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The base branch was changed.