Suppress deprecation messages while running kernel tests (D9 related)

drupalci.yml

@@ -27,7 +27,7 @@ build:
       run_tests.kernel:
         types: 'PHPUnit-Kernel'
         testgroups: 'tmgmt_smartling'
-        suppress-deprecations: false
+        suppress-deprecations: true
         halt-on-fail: false
       run_tests.simpletest:
          types: 'Simpletest'