Tests

Prevent division by zero in anchor normalizer calculation #10812

Job	Run time
Test the code (jax, keras-nightly)	29m 14s
Test the code (torch, keras-stable)	24m 38s
Test the code (openvino, keras-nightly)	4m 26s
Test the code (jax, keras-stable)	29m 14s
Test the code (jax, keras-3.14)	29m 14s
Check the code format	2m 0s
Test the code (tensorflow, keras-stable)	29m 13s
	2h 27m 59s

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