fix(deps): update module cloud.google.com/go/datastore to v1.15.0 #10357

Job	Run time
update-dockle	3s
check-deploy-diff	0s
docker-compose-build-base	0s
build-frontend	0s
docker-compose-build	0s
format-go	5s
update-package	6s
dockle	0s
make-browserslist	0s
e2e-test-all-docker-compose	0s
e2e-test-mini-docker-compose	0s
release-complete-check-docker-compose	0s
deploy-app-engine	0s
create-pr-environment	0s
lighthouse	0s
e2e-test-mini-prd	0s
e2e-test-all-prd	0s
release-complete-check	0s
migrating-traffic	0s
pr-test-complete	0s
remove-app-engine-past-versions	0s
release-complete	0s
	14s

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