docs(spanner): update CHANGELOG.md for releases 6.117.0 through 6.120.0 #23910

Job	Run time
bulk-filter	38s
windows	1m 59s
enforcer	22m 2s
lint	2m 54s
units (8)	1m 2s
gapic-libraries-bom	22m 10s
units (17)	33s
units (25)	46s
units (21)	38s
units (11)	36s
changes	33s
units (26)	43s
split-dependencies (java-spanner)	3m 45s
split-units (java-spanner, 21)	4m 31s
split-units (java-spanner, 25)	4m 44s
split-units (java-spanner, 11)	4m 55s
split-clirr (java-spanner)	9m 7s
split-units (java-spanner, 26)	4m 52s
split-units (java-spanner, 8)	5m 2s
split-units (java-spanner, 17)	4m 53s
conditional-required-check	2s
	1h 36m 25s

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