Update changelog and manifest

Author: alaudazzi

packages/oracle/changelog.yml

@@ -1,4 +1,9 @@
 # newer versions go on top
+- version: "1.31.1"
+  changes:
+    - description: Update the Oracle Integration documentation.
+      type: enhancement
+      link: https://github.com/elastic/integrations/pull/15839
 - version: "1.31.0"
   changes:
     - description: Allow @custom pipeline access to event.original without setting preserve_original_event.

packages/oracle/manifest.yml

@@ -1,7 +1,7 @@
 format_version: "3.0.2"
 name: oracle
 title: "Oracle"
-version: "1.31.0"
+version: "1.31.1"
 description: Collect Oracle Audit Log, Performance metrics, Tablespace metrics, Sysmetrics metrics, System statistics metrics, memory metrics from Oracle database.
 type: integration
 categories: