Bump lightgbm from 4.5.0 to 4.6.0 in /python/lgbserver #3

Job	Run time
explainer-runtime-build	1m 7s
graph-tests-images-build	2m 20s
kserve-image-build	12m 43s
predictor-runtime-build	13m 3s
test-with-helm	10m 5s
test-transformer-explainer-mms	20m 9s
test-path-based-routing	19m 37s
test-kourier	12m 36s
test-predictor	24m 2s
test-graph	12m 31s
test-qpext	11m 38s
test-raw (istio-ingress)	15m 13s
test-huggingface-server-vllm	12m 13s
test-raw (envoy-gatewayapi)	23m 42s
test-llm	12m 13s
test-raw (istio-gatewayapi)	25m 53s
test-modelcache	10m 55s
	4h 0m 0s

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