[updatecli] Bump elastic stack version to 8.15.5 (#1551)

Author: elastic-observability-automation[bot]

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
       matrix:
         stack-version:
           - '8.0.0-SNAPSHOT'
-          - '8.14.1'
+          - '8.15.5'
         scope:
           - '@elastic/apm-rum'
           - '@elastic/apm-rum-core'
@@ -104,4 +104,4 @@ jobs:
         uses: ./.github/workflows/run-test
         with:
           goal: 'coverage'
-          stack-version: '8.14.1'
+          stack-version: '8.15.5'

.github/workflows/microbenchmark.yml

@@ -5,7 +5,7 @@ on:
     inputs:
       stack_version:
         description: 'Stack Version'
-        default: '8.14.1'
+        default: '8.15.5'
         required: false
   push:
     branches:
@@ -26,7 +26,7 @@ jobs:
       - name: Run buildkite pipeline
         uses: elastic/oblt-actions/buildkite/run@v1
         env:
-          STACK_VERSION: ${{ inputs.stack_version || '8.14.1' }}
+          STACK_VERSION: ${{ inputs.stack_version || '8.15.5' }}
         with:
           token: ${{ secrets.BUILDKITE_TOKEN }}
           pipeline: apm-agent-microbenchmark