Bump go 1.19: increase the TestKVDelete's timeout to 15s

After upgrading to go 1.19, the test case needs more time
to execute, it might be related to the Runtime change in go 1.18.
Some applications may now use less memory and spend more time on
garbage collection, or vice versa, than before.

Refer to https://tip.golang.org/doc/go1.18#runtime

Signed-off-by: Benjamin Wang <wachao@vmware.com>

tests/common/kv_test.go

@@ -123,7 +123,7 @@ func TestKVDelete(t *testing.T) {
 	testRunner.BeforeTest(t)
 	for _, tc := range clusterTestCases {
 		t.Run(tc.name, func(t *testing.T) {
-			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 			defer cancel()
 			clus := testRunner.NewCluster(ctx, t, tc.config)
 			defer clus.Close()