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Fix path separators in build-msi.sh for Windows compatibility #3234

Job	Run time
docker-build-accounts	1m 38s
docker-build-admin-dashboard	2m 4s
docker-build-api-reference	1m 24s
docker-build-app	1m 32s
docker-build-copilot	1m 59s
docker-build-dashboard	2m 58s
docker-build-docs	1m 23s
docker-build-e2e	2m 39s
docker-build-haraka	57s
docker-build-home	1m 17s
docker-build-isolated-vm	1m 17s
docker-build-otel-collector	22s
docker-build-probe	2m 46s
docker-build-worker	1m 22s
docker-build-workflow	1m 22s
docker-build-fluent-ingest	2m 51s
docker-build-incoming-request-ingest	2m 51s
docker-build-open-telemetry-ingest	3m 4s
docker-build-probe-ingest	3m 4s
docker-build-test-server	1m 13s
docker-build-status-page	1m 52s
	39m 55s

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