build(deps): bump gitpython from 3.1.43 to 3.1.47 in /hermetic_build/release_note_generation #13315

Job	Run time
build (17)	14m 2s
build(25) except self-service clients	12m 40s
compatibility	1m 22s
build(21) except self-service clients	13m 18s
build(8) for gapic-generator-java	10m 45s
build(8) for showcase	8m 23s
build (11)	14m 28s
build(8) except for gapic-generator-java	4m 19s
lint	57s
dependency_analyzer_unit_test	26s
unmanaged_dependency_check	6m 28s
showcase-clirr	3m 29s
gapic-generator-java-bom	2m 12s
showcase (11)	10m 17s
showcase (17)	10m 36s
showcase (25)	10m 37s
showcase (21)	10m 13s
	2h 14m 32s

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