sources/oauth: fix authentication only being sent in form body

[BeryJu]

Details

closes #9895

See https://datatracker.ietf.org/doc/html/rfc6749#section-2.3.1

We previously only sent credentials as part of the body which according to the RFC is optional, however sending the credentials as Authorization header is required

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[github-actions]

authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-b84a30def633f796fbf27b7af9dab50c9999a480
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

For arm64, use these values:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-b84a30def633f796fbf27b7af9dab50c9999a480-arm64
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

Add the following block to your values.yml file:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-b84a30def633f796fbf27b7af9dab50c9999a480

For arm64, use these values:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-b84a30def633f796fbf27b7af9dab50c9999a480-arm64

Afterwards, run the upgrade commands from the latest release notes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.77%. Comparing base (f354574) to head (b84a30d).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12713      +/-   ##
==========================================
+ Coverage   92.70%   92.77%   +0.06%     
==========================================
  Files         769      769              
  Lines       38898    38898              
==========================================
+ Hits        36059    36086      +27     
+ Misses       2839     2812      -27     

Flag	Coverage Δ
e2e	48.58% <ø> (+0.09%)	⬆️
integration	24.62% <ø> (ø)
unit	90.40% <ø> (ø)

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