add minimized test case for oss-fuzz issue 11691
diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5686369209286656 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5686369209286656
new file mode 100644
index 0000000..9f47ca8
--- /dev/null
+++ b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5686369209286656
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