chore(ci): update system tests version (#15489)

## Description

Update system tests version.

Author: christophe-papazian

.github/workflows/system-tests.yml

@@ -45,7 +45,7 @@ jobs:
           persist-credentials: false
           repository: 'DataDog/system-tests'
           # Automatically managed, use scripts/update-system-tests-version to update
-          ref: '6127593e1f1a6ce1b89bcba0ad83f51129974d6b'
+          ref: '31bc180ce87184c996400361ddb17c8743eec18f'
 
       - name: Download wheels to binaries directory
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
@@ -90,7 +90,7 @@ jobs:
           persist-credentials: false
           repository: 'DataDog/system-tests'
           # Automatically managed, use scripts/update-system-tests-version to update
-          ref: '6127593e1f1a6ce1b89bcba0ad83f51129974d6b'
+          ref: '31bc180ce87184c996400361ddb17c8743eec18f'
 
       - name: Build runner
         uses: ./.github/actions/install_runner
@@ -283,7 +283,7 @@ jobs:
           persist-credentials: false
           repository: 'DataDog/system-tests'
           # Automatically managed, use scripts/update-system-tests-version to update
-          ref: '6127593e1f1a6ce1b89bcba0ad83f51129974d6b'
+          ref: '31bc180ce87184c996400361ddb17c8743eec18f'
       - name: Download wheels to binaries directory
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:

.gitlab-ci.yml

@@ -14,7 +14,7 @@ variables:
   DD_VPA_TEMPLATE: "vpa-template-cpu-p70-10percent-2x-oom-min-cap"
   # CI_DEBUG_SERVICES: "true"
   # Automatically managed, use scripts/update-system-tests-version to update
-  SYSTEM_TESTS_REF: "6127593e1f1a6ce1b89bcba0ad83f51129974d6b"
+  SYSTEM_TESTS_REF: "31bc180ce87184c996400361ddb17c8743eec18f"
 
 default:
   interruptible: true