add expandconverter dep #6

Job	Run time
setup-environment	32s
govulncheck	29s
test-coverage	1m 48s
lint	1m 53s
checks	45s
unittest-matrix (~1.22)	24s
unittest-matrix (~1.21.5)	1m 30s
cross-build-collector (darwin, amd64)	11s
cross-build-collector (darwin, arm64)	11s
cross-build-collector (linux, 386)	10s
cross-build-collector (linux, amd64)	23s
cross-build-collector (linux, arm64)	17s
cross-build-collector (linux, ppc64le)	11s
cross-build-collector (linux, arm, 7)	11s
cross-build-collector (linux, s390x)	10s
cross-build-collector (windows, 386)	10s
cross-build-collector (windows, amd64)	9s
unittest	1s
	9m 25s

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