fix: set accept header for GitLab

[aeneasr]

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

[codecov]

Codecov Report

Merging #2998 (6d26e5c) into master (6d26e5c) will not change coverage.
The diff coverage is n/a.

❗ Current head 6d26e5c differs from pull request most recent head 016a809. Consider uploading reports for the commit 016a809 to get more accurate results

@@           Coverage Diff           @@
##           master    #2998   +/-   ##
=======================================
  Coverage   76.20%   76.20%           
=======================================
  Files         309      309           
  Lines       19085    19085           
=======================================
  Hits        14543    14543           
  Misses       3419     3419           
  Partials     1123     1123           

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