Update image scan workflow to v1.32.6 (#970)

*Description of changes:*

Updating image scan workflow to v1.32.6 as part of MCM release for new
version.

**NOTE: MERGE AFTER
#969

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: yiyuan-he

.github/workflows/owasp.yml

@@ -77,15 +77,15 @@ jobs:
         id: high_scan
         uses: ./.github/actions/image_scan
         with:
-          image-ref: "public.ecr.aws/aws-observability/adot-autoinstrumentation-java:v1.32.5"
+          image-ref: "public.ecr.aws/aws-observability/adot-autoinstrumentation-java:v1.32.6"
           severity: 'CRITICAL,HIGH'
 
       - name: Perform low image scan
         if: always()
         id: low_scan
         uses: ./.github/actions/image_scan
         with:
-          image-ref: "public.ecr.aws/aws-observability/adot-autoinstrumentation-java:v1.32.5"
+          image-ref: "public.ecr.aws/aws-observability/adot-autoinstrumentation-java:v1.32.6"
           severity: 'MEDIUM,LOW,UNKNOWN'
 
       - name: Configure AWS Credentials for emitting metrics