Fix encoded exfil runtime dependency metadata

Signed-off-by: lucarlig <luca.carlig@ibm.com>

Author: lucarlig

plugins/rust/python-package/encoded_exfil_detection/pyproject.toml

@@ -10,6 +10,9 @@ authors = [{ name = "ContextForge Contributors" }]
 license = { text = "Apache-2.0" }
 readme = "README.md"
 requires-python = ">=3.11"
+dependencies = [
+    "pydantic>=2,<3",
+]
 classifiers = [
     "Programming Language :: Rust",
     "Programming Language :: Python :: Implementation :: CPython",