Added required version field to pyproject.toml

Author: Pusty

pyproject.toml

@@ -6,6 +6,7 @@ build-backend = "maturin"
 name = "egglog"
 description = "e-graphs in Python built around the the egglog rust library"
 readme = "README.md"
+dynamic = ["version"]
 license = { text = "MIT" }
 requires-python = ">=3.10"
 classifiers = [