fix: update FastAPI to 0.112.2

[Lancetnik]

Description

Please include a summary of the change and specify which issue is being addressed. Additionally, provide relevant motivation and context.

Type of change

Please delete options that are not relevant.

• Documentation (typos, code examples, or any documentation updates)
• Bug fix (a non-breaking change that resolves an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a fix or feature that would disrupt existing functionality)
• This change requires a documentation update

Checklist

• My code adheres to the style guidelines of this project (scripts/lint.sh shows no errors)
• I have conducted a self-review of my own code
• I have made the necessary changes to the documentation
• My changes do not generate any new warnings
• I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• Both new and existing unit tests pass successfully on my local environment by running scripts/test-cov.sh
• I have ensured that static analysis tests are passing by running scripts/static-analysis.sh
• I have included code examples to illustrate the modifications

[Lancetnik]

I just can't test docs generation due it didn't trigger at PR commit

[kumaranvpl]

I just can't test docs generation due it didn't trigger at PR commit

@Lancetnik Are you saying that Generate API References documentation is not triggered automatically for PRs?
I could see list of runs here - https://github.com/airtai/faststream/actions/workflows/docs_update-references.yaml?query=branch%3Afix%2Fupdate-fastapi

[Lancetnik]

@Lancetnik Are you saying that Generate API References documentation is not triggered automatically for PRs?
I could see list of runs here - https://github.com/airtai/faststream/actions/workflows/docs_update-references.yaml?query=branch%3Afix%2Fupdate-fastapi

I just can't understand the trigger logic. Seems like it runs only at first commit in PR. Probably, GH had some lags yesterday. Anyway, we should change this action user to make it triggering test CI.