fix for ruamel update

Author: scarlehoff

pyproject.toml

@@ -63,7 +63,7 @@ matplotlib = "^3.9"
 pineappl = "^1.0.0"
 pandas = "*"
 numpy = "*"
-"ruamel.yaml" = "*"
+"ruamel.yaml" = {version = ">=0.19.1", extras=["oldlibyaml"]}
 validobj = "*"
 prompt_toolkit = "*"
 reportengine = ">=0.32"