[BEAM-10974] Skip GroupByKeyTest.testLargeKeys10MB. (#13480)

Co-authored-by: Kyle Weaver <kcweaver@google.com>

Author: lostluck

runners/flink/job-server/flink_job_server.gradle

@@ -153,7 +153,8 @@ def portableValidatesRunnerTask(String name, Boolean streaming, Boolean checkpoi
       } else {
         includeCategories 'org.apache.beam.sdk.testing.ValidatesRunner'
         excludeCategories 'org.apache.beam.sdk.testing.FlattenWithHeterogeneousCoders'
-        excludeCategories 'org.apache.beam.sdk.testing.LargeKeys$Above100MB'
+        // Larger keys are possible, but they require more memory.
+        excludeCategories 'org.apache.beam.sdk.testing.LargeKeys$Above10MB'
         excludeCategories 'org.apache.beam.sdk.testing.UsesCommittedMetrics'
         excludeCategories 'org.apache.beam.sdk.testing.UsesCrossLanguageTransforms'
         excludeCategories 'org.apache.beam.sdk.testing.UsesCustomWindowMerging'