add minimized test case for oss-fuzz issue 11713
diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5660711141769216 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5660711141769216
new file mode 100644
index 0000000..302a1c4
--- /dev/null
+++ b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5660711141769216
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