chore: Bump healthcheck timeout to 45 seconds

[hubertdeng123]

For some users, snuba healthcheck may take over 30 seconds to become healthy. Bumping the timeout here to account for that

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.85%. Comparing base (1c85390) to head (6781f22).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #190   +/-   ##
=======================================
  Coverage   92.85%   92.85%           
=======================================
  Files          22       22           
  Lines        1470     1470           
=======================================
  Hits         1365     1365           
  Misses        105      105           

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