chore: bump pybind11 (#658)

henryiii · web-flow · commit a9be09e16d76 · 2021-10-04T21:23:08.000-04:00
diff --git a/extern/pybind11 b/extern/pybind11
@@ -1 +1 @@
-Subproject commit 787d2c88cafa4d07fb38c9519c485a86323cfcf4
+Subproject commit 97976c16fb7652f7faf02d76756666ef87adbe7d
