feat(fluent-bit): Updated image to v3.1.5 (#541)

Signed-off-by: Steve Hipwell <steve.hipwell@gmail.com>

charts/fluent-bit/Chart.yaml

@@ -5,8 +5,8 @@ keywords:
   - logging
   - fluent-bit
   - fluentd
-version: 0.47.5
-appVersion: 3.1.4
+version: 0.47.6
+appVersion: 3.1.5
 icon: https://raw.githubusercontent.com/cncf/artwork/master/projects/fluentd/fluentbit/icon/fluentbit-icon-color.svg
 home: https://fluentbit.io/
 sources:
@@ -23,4 +23,4 @@ maintainers:
 annotations:
   artifacthub.io/changes: |
     - kind: changed
-      description: "Updated Fluent Bit OCI image to v3.1.4."
+      description: "Updated Fluent Bit OCI image to v3.1.5."