Update dependency fastapi to v0.115.12

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
fastapi (changelog)	==0.115.11 -> ==0.115.12

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This MR has been generated by Renovate Bot.

enabled an automatic merge when the pipeline for 8a915348 succeeds

mentioned in issue #1

merged

mentioned in commit c8f6ab77