[chore]: Fix Alembic `path_separator` warning #5937

Job	Run time
compute-version	2s
build-docs / build-docs	1m 8s
build-artifacts / frontend-build	13s
build-artifacts / runner-test (ubuntu-latest)	37s
build-artifacts / code-lint	40s
build-artifacts / runner-test (macos-latest)	43s
build-artifacts / gateway-build	10s
build-artifacts / python-build	26s
build-artifacts / generate-json-schema	21s
build-artifacts / python-test (macos-latest, 3.10)	2m 10s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 38s
build-artifacts / python-test (ubuntu-latest, 3.10)	5m 11s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 39s
build-artifacts / python-test (windows-latest, 3.9)	2m 1s
build-artifacts / python-test (macos-latest, 3.11)	3m 12s
build-artifacts / python-test (macos-latest, 3.13)	3m 44s
build-artifacts / python-test (macos-latest, 3.9)	3m 31s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 24s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 35s
build-artifacts / python-test (windows-latest, 3.13)	1m 59s
build-artifacts / python-test (windows-latest, 3.10)	2m 5s
build-artifacts / python-test (windows-latest, 3.11)	1m 55s
build-artifacts / python-test (macos-latest, 3.12)	3m 27s
build-artifacts / python-test (windows-latest, 3.12)	2m 17s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	22s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	21s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	15s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
	55m 20s

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