Bump version to 0.19.3

Author: sewhyte

CONTRIBUTING.md

@@ -8,7 +8,7 @@ The version is defined statically in `pyproject.toml`:
 
 ```toml
 [project]
-version = "0.19.2"
+version = "0.19.3"
 ```
 
 To cut a release, update the `version` field manually and open a PR against `main`.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "gremlinapi"
-version = "0.19.2"
+version = "0.19.3"
 description = "Gremlin library for Python"
 readme = "README.md"
 license = { text = "Apache 2.0" }