fix: unpinned traitlets version, instead its <= (#59)

Co-authored-by: Gerald Walter Irsiegler <gerald@Irsiegler-P14s>

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "openeo-pg-parser-networkx"
-version = "2023.8.1"
+version = "2023.8.2"
 
 description = "Parse OpenEO process graphs from JSON to traversible Python objects."
 authors = ["Lukas Weidenholzer <[email protected]>", "Sean Hoyal <[email protected]>", "Valentina Hutter <[email protected]>", "Gerald Irsiegler <[email protected]>"]
@@ -32,7 +32,7 @@ geojson-pydantic = "^0.5.0"
 numpy = "^1.20.3"
 pendulum = "^2.1.2"
 matplotlib = { version = "^3.7.1", optional = true }
-traitlets = "5.9.0"
+traitlets = "<=5.9.0"
 
 [tool.poetry.group.dev.dependencies]
 matplotlib = "^3.7.1"