Bump dev version (#337)

### Description
Bump dev version to release new custom granularity spec to MF.

### Checklist

- [ ] 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
- [ ] I have signed the
[CLA](https://docs.getdbt.com/docs/contributor-license-agreements)
- [ ] This PR includes tests, or tests are not required/relevant for
this PR
- [ ] I have run `changie new` to [create a changelog
entry](https://github.com/dbt-labs/dbt-semantic-interfaces/blob/main/CONTRIBUTING.md#adding-a-changelog-entry)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "dbt-semantic-interfaces"
-version = "0.7.0"
+version = "0.7.1.dev0"
 description = 'The shared semantic layer definitions that dbt-core and MetricFlow use'
 readme = "README.md"
 requires-python = ">=3.8"