[Release] Bump version to v1.0.0-alpha.13

Closes #120

Signed-off-by: David Feltell <david.feltell@foundry.com>

Author: feltech

RELEASE_NOTES.md

@@ -1,7 +1,7 @@
 Release Notes
 =============
 
-v1.0.0-alpha.x
+v1.0.0-alpha.13
 --------------
 
 ### Breaking changes

pyproject.toml

@@ -10,7 +10,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "openassetio-traitgen"
-version = "1.0.0a12"
+version = "1.0.0a13"
 requires-python = ">=3.10"
 dependencies = ["jinja2==3.1.6", "pyyaml==6.0.0", "jsonschema==4.7.2"]