Aiosalesforce

What's Changed
* Fixed CSV serializer for Bulk API 2.0
* Added more tests for CSV serializer

**Full Changelog**: https://github.com/georgebv/aiosalesforce/compare/v0.5.3...v0.5.4

What's Changed
* Fixed bug with bulk incorrectly serializing headers for nested relations

**Full Changelog**: https://github.com/georgebv/aiosalesforce/compare/v0.5.2...v0.5.3

What's Changed
* Added expiration mechanism for `ClientCredentialsFlow` - it now accepts `timeout` parameter
* Fixed bug when providing a generator to bulk client without fieldnames - generator used to be exhausted to generate headers and loop generating csv would receive an already exhausted generator, resulting in no data returned. Now generator is 'duplicated' using `itertools.tee`
* Fixed bug with incorrect csv row counting in bulk v2 - header is no longer counted towards record limit in bulk csv payload

**Full Changelog**: https://github.com/georgebv/aiosalesforce/compare/v0.5.1...v0.5.2

What's Changed
* Updated type hints to be less restrictive (e.g., `Iterable[T]` instead of `list[T]`)
* Fixed bug with emitted `RetryEvent` having incorrect (higher by 1) attempt count

**Full Changelog**: https://github.com/georgebv/aiosalesforce/compare/v0.5.0...v0.5.1

What's Changed
* Refactored request retries - everything is now handled by `RetryContext`. This reduces code duplication by putting request retry handling logic inside the retrying policy
* Refactored authentication class signatures - now they take single `Salesforce` client instance instead of many separate dependencies

**Full Changelog**: https://github.com/georgebv/aiosalesforce/compare/v0.4.0...v0.5.0

What's Changed
* Added Bulk API 2.0 client accessible via `bulk_v2` attribute of `Salesforce` client
* Added `get_limits` method to `Salesforce` client

**Full Changelog**: https://github.com/georgebv/aiosalesforce/compare/v0.3.0...v0.4.0