Update gnbsim, sctplb images

- Also correcting metricfunction name in the helm charts
- Updating mongoDB helm charts

Change-Id: I9627cd6e819f1c91ad7b8d571c448cb23ab912ee
diff --git a/5g-test-apps/Chart.yaml b/5g-test-apps/Chart.yaml
index 232a463..4e15d7c 100644
--- a/5g-test-apps/Chart.yaml
+++ b/5g-test-apps/Chart.yaml
@@ -8,10 +8,10 @@
 name: 5g-test-apps
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 0.2.0
+version: 0.2.1
 
 dependencies:
   - name: mongodb
-    version: 10.7.1
+    version: 10.31.5
     repository: https://charts.bitnami.com/bitnami
     condition: mongodb.deploy