Enable Perf Testing Workflow for Lambda Java Layer v2 (#445)

The current Lambda Java Layer performance testing workflow is hard-coded
to use the ADOT v1.33 branch. This PR updates the workflow to use the
ADOT v2.11.x branch, which will unblock the release process for Lambda
Java Layer v2.


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

Author: lukeina2z

.github/workflows/java-lambda-layer-perf-test.yml

@@ -38,7 +38,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         repository: aws-observability/aws-otel-java-instrumentation
-        ref: release/v1.33.x
+        ref: release/v2.11.x
         path: aws-otel-java-instrumentation
 
     - name: Setup Terraform