Bump github.com/SAP/go-hdb from 1.3.10 to 1.5.8 in /internal/signalfx-agent #6728

Job	Run time
setup-environment	3m 4s
coverage	7m 2s
cross-compile (binaries-darwin_amd64)	5m 42s
generate-metrics	7m 3s
gofmt	7m 0s
cross-compile (binaries-darwin_arm64)	5m 44s
cross-compile (binaries-linux_amd64)	5m 46s
lint	9m 0s
cross-compile (binaries-linux_arm64)	5m 39s
test	8m 15s
tidy	2m 52s
cross-compile (binaries-windows_amd64)	5m 27s
cross-compile (binaries-linux_ppc64le)	5m 45s
	1h 18m 19s

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