[gha] Bump open-edge-platform/orch-ci/.github/workflows/post-merge.yml from 9dd2c3c151c78a117f6a0a97d62396e60f37c773 to b6610539eb98ed7bd5903e6629e48c1da39d883b

[gha] Bump open-edge-platform/orch-ci/.github/workflows/post-merge.yml from 9dd2c3c151c78a117f6a0a97d62396e60f37c773 to b6610539eb98ed7bd5903e6629e48c1da39d883b #1543