Update valgrind suppressions (#2951)

Author: dweindl

python/tests/valgrind-python.supp

@@ -1126,3 +1126,13 @@
    fun:_ZN8pybind1112cpp_function18initialize_genericEOSt10unique_ptrINS_6detail15function_recordENS0_33InitializingFunctionRecordDeleterEEPKcPKPKSt9type_infom
    ...
 }
+
+{
+   pydantic
+   Memcheck:Leak
+   match-leak-kinds: definite
+   ...
+   fun:PyInit__pydantic_core
+   fun:_PyImport_RunModInitFunc
+   ...
+}