[chore][confighttp] Fix NewDefaultServerConfig (#13129) #30803

Job	Run time
govulncheck	38s
setup-environment	19s
lint	5m 4s
checks	2m 46s
test-coverage	9m 32s
unittest-matrix (ubuntu-latest, ~1.24)	3m 44s
cross-build-collector (darwin, amd64)	54s
cross-build-collector (darwin, arm64)	50s
unittest-matrix (ubuntu-latest, ~1.23)	3m 38s
cross-build-collector (linux, arm, 7)	55s
cross-build-collector (linux, ppc64le)	56s
cross-build-collector (linux, 386)	50s
cross-build-collector (linux, arm64)	56s
cross-build-collector (linux, amd64)	47s
cross-build-collector (aix, ppc64)	52s
cross-build-collector (windows, 386)	56s
cross-build-collector (windows, amd64)	58s
cross-build-collector (linux, s390x)	51s
unittest	12s
	35m 38s

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