[Core] bump fastapi version (#1116)

# Description

What - bump fastapi version to 0.115.3 to upgrade starlette

Why - https://github.com/port-labs/ocean/security/dependabot/433 

How - bump fastapi version

## Type of change

Please leave one option from the following and delete the rest:

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] New Integration (non-breaking change which adds a new integration)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [X] Non-breaking change (fix of existing functionality that will not
change current behavior)
- [ ] Documentation (added/updated documentation)

<h4> All tests should be run against the port production
environment(using a testing org). </h4>

### Core testing checklist

- [x] Integration able to create all default resources from scratch
- [x] Resync finishes successfully
- [x] Resync able to create entities
- [x] Resync able to update entities
- [x] Resync able to detect and delete entities
- [x] Scheduled resync able to abort existing resync and start a new one
- [x] Tested with at least 2 integrations from scratch
- [x] Tested with Kafka and Polling event listeners
- [x] Tested deletion of entities that don't pass the selector


### Integration testing checklist

- [ ] Integration able to create all default resources from scratch
- [ ] Resync able to create entities
- [ ] Resync able to update entities
- [ ] Resync able to detect and delete entities
- [ ] Resync finishes successfully
- [ ] If new resource kind is added or updated in the integration, add
example raw data, mapping and expected result to the `examples` folder
in the integration directory.
- [ ] If resource kind is updated, run the integration with the example
data and check if the expected result is achieved
- [ ] If new resource kind is added or updated, validate that
live-events for that resource are working as expected
- [ ] Docs PR link [here](#)

### Preflight checklist

- [ ] Handled rate limiting
- [ ] Handled pagination
- [ ] Implemented the code in async
- [ ] Support Multi account

## Screenshots

Include screenshots from your environment showing how the resources of
the integration will look.

## API Documentation

Provide links to the API documentation used for this integration.

---------

Co-authored-by: Shalev Avhar <[email protected]>
Co-authored-by: Tom Tankilevitch <[email protected]>

CHANGELOG.md

@@ -7,6 +7,13 @@ this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 <!-- towncrier release notes start -->
 
+## 0.12.8 (2024-11-04)
+
+
+### Improvements
+
+- Bump fastapi to version 0.115.3 - fix Starlette Denial of service (DoS) via multipart/form-data (0.12.8)
+
 ## 0.12.7 (2024-10-23)