ci: fix body handling for issue response

[bduranleau-nr]

No description provided.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	9/9 passing
SOAK	❌	55/56 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.72%. Comparing base (4f470da) to head (956459c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #889   +/-   ##
=======================================
  Coverage   78.72%   78.72%           
=======================================
  Files         193      193           
  Lines       27214    27214           
=======================================
  Hits        21423    21423           
  Misses       5791     5791           

Flag	Coverage Δ
agent-for-php-7.0	77.45% <ø> (ø)
agent-for-php-7.1	77.21% <ø> (ø)
agent-for-php-7.2	?
agent-for-php-7.3	78.15% <ø> (ø)
agent-for-php-7.4	77.86% <ø> (ø)
agent-for-php-8.0	77.92% <ø> (ø)
agent-for-php-8.1	77.91% <ø> (ø)
agent-for-php-8.2	77.51% <ø> (ø)
agent-for-php-8.3	77.51% <ø> (ø)

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