Tests

fix: make dropout rate configurable in SegFormerImageSegmenter #9936

Job	Run time
Check the code format	1m 53s
Test the code (jax, keras-stable)	1h 4m 10s
Test the code (tensorflow, keras-stable)	45m 10s
Test the code (jax, keras-nightly)	1h 3m 36s
Test the code (torch, keras-stable)	22m 56s
Test the code (jax, keras-3.13)	56m 54s
Test the code (openvino, keras-nightly)	3m 59s
	4h 18m 38s

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