chore: add headers to web hook config

[sashatalalasha]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[zepatrik]

Nice 👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.01%. Comparing base (ad0619d) to head (fe57a68).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3849   +/-   ##
=======================================
  Coverage   78.01%   78.01%           
=======================================
  Files         359      359           
  Lines       25203    25203           
=======================================
  Hits        19662    19662           
  Misses       4034     4034           
  Partials     1507     1507           

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