chore: Updated to content "'8.9.1'" in file ".github/workflows/microb...

... enchmark.yml"

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.github/workflows/microbenchmark.yml

@@ -5,7 +5,7 @@ on:
     inputs:
       stack_version:
         description: 'Stack Version'
-        default: '8.6.1'
+        default: '8.9.1'
         required: false
   push:
     branches:
@@ -28,7 +28,7 @@ jobs:
         name: Run buildkite pipeline
         uses: elastic/apm-pipeline-library/.github/actions/buildkite@current
         env:
-          STACK_VERSION: ${{ inputs.stack_version || '8.6.1' }}
+          STACK_VERSION: ${{ inputs.stack_version || '8.9.1' }}
         with:
           vaultUrl: ${{ secrets.VAULT_ADDR }}
           vaultRoleId: ${{ secrets.VAULT_ROLE_ID }}