Fix shim tests binding to 0 port (#1846) #218

Job	Run time
gateway-build	14s
frontend-build	59s
python-lint	15s
runner-test	1m 18s
python-test (macos-latest, 3.8)	4m 2s
python-test (macos-latest, 3.9)	1m 59s
python-test (macos-latest, 3.10)	1m 58s
python-test (macos-latest, 3.11)	2m 4s
python-test (macos-latest, 3.12)	1m 56s
python-test (ubuntu-latest, 3.8)	2m 9s
python-test (ubuntu-latest, 3.9)	4m 22s
python-test (ubuntu-latest, 3.10)	4m 19s
python-test (ubuntu-latest, 3.11)	4m 9s
python-test (ubuntu-latest, 3.12)	4m 19s
python-test (windows-latest, 3.8)	5m 6s
python-test (windows-latest, 3.9)	5m 4s
python-test (windows-latest, 3.10)	6m 24s
python-test (windows-latest, 3.11)	6m 36s
python-test (windows-latest, 3.12)	6m 52s
runner-compile (linux, amd64, ubuntu-latest)	19s
runner-upload	18s
pypi-upload	26s
update-get-dstack-tag	8s
generate-json-schema	1m 0s
server-docker-upload	12m 14s
	1h 18m 30s

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