Add implicit osm-config configuration parameter to charm

- feature 10800: day-2 primitives for Helm Charts
- osm-config is only used for now in KDUs

Change-Id: I7c8c3f8d4c7d5281038b243de48d704f781b5d47
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/requirements.in b/requirements.in
index 3b86ffc..6efebb2 100644
--- a/requirements.in
+++ b/requirements.in
@@ -19,3 +19,4 @@
 idna
 jinja2
 pyyaml==5.4.1
+pydantic