0.5.0a3 Release PR (#246)

Resolves #248

### Description

Release PR for 0.5.0a3. Includes:

- Pydantic 2 support
- QoL changes
  - security tracking
  - dependabot
  - wheel distribution fix


### Checklist

- [X] I have read [the contributing
guide](https://github.com/dbt-labs/dbt-semantic-interfaces/blob/main/CONTRIBUTING.md)
and understand what's expected of me
- [X] I have signed the
[CLA](https://docs.getdbt.com/docs/contributor-license-agreements)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "dbt-semantic-interfaces"
-version = "0.5.0a2"
+version = "0.5.0a3"
 description = 'The shared semantic layer definitions that dbt-core and MetricFlow use'
 readme = "README.md"
 requires-python = ">=3.8"