Fix path separators in build-msi.sh for Windows compatibility #2465

Job	Run time
generate-build-number	7s
e2e-docker-image-deploy	15m 36s
llm-docker-image-deploy	6m 14s
home-docker-image-deploy	17m 12s
isolated-vm-docker-image-deploy	8m 17s
nginx-docker-image-deploy	6m 59s
otel-collector-docker-image-deploy	1m 2s
status-page-docker-image-deploy	13m 1s
test-server-docker-image-deploy	16m 22s
admin-dashboard-docker-image-deploy	25m 35s
dashboard-docker-image-deploy	1m 19s
fluent-ingest-docker-image-deploy	15m 54s
haraka-docker-image-deploy	4m 29s
incoming-request-ingest-docker-image-deploy	15m 35s
open-telemetry-ingest-docker-image-deploy	16m 15s
probe-docker-image-deploy	15m 53s
probe-ingest-docker-image-deploy	16m 46s
test-docker-image-deploy	1m 40s
accounts-docker-image-deploy	11m 27s
api-reference-docker-image-deploy	16m 52s
app-docker-image-deploy	8m 54s
copilot-docker-image-deploy	9m 29s
docs-docker-image-deploy	8m 0s
infrastructure-agent-deploy	2m 37s
worker-docker-image-deploy	17m 24s
workflow-docker-image-deploy	8m 44s
test-helm-chart	0s
test-e2e-test-saas	0s
test-e2e-test-self-hosted	0s
	4h 41m 43s

Provide feedback