fix: Add await boundary for response sending

[ovr]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.09%. Comparing base (6271520) to head (7547bbc).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/cubejs-api-gateway/src/gateway.ts	25.00%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10233   +/-   ##
=======================================
  Coverage   55.09%   55.09%           
=======================================
  Files         221      221           
  Lines       17109    17109           
  Branches     3498     3498           
=======================================
  Hits         9427     9427           
  Misses       7184     7184           
  Partials      498      498           

Flag	Coverage Δ
cube-backend	55.09% <25.00%> (ø)

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