Increase shor_modular_exponentiation.ipynb timeout

Author: nivclassiq

tests/resources/timeouts.yaml

@@ -268,7 +268,7 @@ set_partition.ipynb: 350
 set_partition.qmod: 350
 shor.ipynb: 104
 shor.qmod: 88
-shor_modular_exponentiation.ipynb: 300
+shor_modular_exponentiation.ipynb: 450
 shor_modular_exponentiation.qmod: 300
 simon.ipynb: 40
 simon_example.qmod: 30