deps: update dependency lxml to v5.3.0 #7622

Job	Run time
build (11)	15m 28s
build (11)	15m 28s
build (11)	15m 28s
build (17)	14m 33s
build (17)	14m 33s
build (17)	14m 33s
build(8) for gapic-generator-java	12m 11s
build(8) for gapic-generator-java	12m 11s
build(8) for gapic-generator-java	12m 11s
build(8) except for gapic-generator-java	4m 15s
build(8) except for gapic-generator-java	4m 15s
build(8) except for gapic-generator-java	4m 15s
compatibility	1m 45s
compatibility	1m 45s
compatibility	1m 45s
build(21) except self-service clients	13m 35s
build(21) except self-service clients	13m 35s
build(21) except self-service clients	13m 35s
gapic-generator-java-bom	1m 55s
gapic-generator-java-bom	1m 55s
gapic-generator-java-bom	1m 55s
dependency_analyzer_unit_test	13s
dependency_analyzer_unit_test	13s
dependency_analyzer_unit_test	13s
lint	21s
lint	21s
lint	21s
showcase (11)	4m 9s
showcase (11)	4m 9s
showcase (11)	4m 9s
showcase-clirr	2m 56s
showcase-clirr	2m 56s
showcase-clirr	2m 56s
showcase (17)	5m 9s
showcase (17)	4m 15s
showcase (17)	4m 15s
unmanaged_dependency_check	4m 34s
unmanaged_dependency_check	4m 34s
unmanaged_dependency_check	4m 34s
showcase (21)	4m 0s
showcase (21)	4m 0s
showcase (21)	4m 0s
showcase-native	7m 44s
showcase-native	7m 44s
showcase-native	8m 14s
	4h 37m 6s

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