Longer timeout in RepositoryAnalysisSuccessIT (elastic#72314)

In elastic#72229 a test run was observed to exceed this 5-second timeout. This
commit increases it to 20 seconds.

x-pack/plugin/snapshot-repo-test-kit/src/internalClusterTest/java/org/elasticsearch/repositories/blobstore/testkit/RepositoryAnalysisSuccessIT.java

@@ -115,7 +115,7 @@ public void testRepositoryAnalysis() {
             blobStore.ensureMaxTotalBlobSize(request.getMaxTotalDataSize().getBytes());
         }
 
-        request.timeout(TimeValue.timeValueSeconds(5));
+        request.timeout(TimeValue.timeValueSeconds(20));
 
         final RepositoryAnalyzeAction.Response response = client().execute(RepositoryAnalyzeAction.INSTANCE, request)
             .actionGet(30L, TimeUnit.SECONDS);