fix: Add missing content-type

[tevincent]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Adds an explicit JSON Content-Type header to two Ktor POST requests so the backend reliably receives the payload as JSON (and Ktor’s serialization/content negotiation behaves consistently).

Changes:

• Set contentType(ContentType.Application.Json) for the notifications device registration POST.
• Set contentType(ContentType.Application.Json) for the cross-app device info update POST.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Notifications/Registration/src/main/kotlin/AbstractNotificationsRegistrationWorker.kt	Adds explicit JSON Content-Type to the device registration POST request.
CrossAppLogin/Back/src/main/kotlin/com/infomaniak/core/crossapplogin/back/internal/deviceinfo/AbstractDeviceInfoUpdateWorker.kt	Adds explicit JSON Content-Type to the device info update POST request.

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