Deprecated usage of string interpolation

[DjLeChuck]

Reason for change

Using ${var} in strings is deprecated, use {$var} instead. The warning is visible during a clear:cache for example.

Code changes

I’ve fix the two usage of string interpolation.

How to test

As a reviewer, you are encouraged to test the PR locally.

Checklist for authors and reviewers

• The title of the PR uses business wording, not technical jargon, for the changelog readers to understand it
• You understand the impact of this PR on existing code/features

Non applicable

• The PR implements the changes asked in the referenced task / issue
• The automated tests are compliant with the testing strategy
• The tests are relevant, and cover the corner/error cases, not only the happy path
• The changes include adequate logging and Datadog traces
• Documentation is updated (API, developer documentation, ADR, Notion...)