[gha] Bump open-edge-platform/orch-ci/.github/workflows/post-merge.yml from 5d5d08245bb57937b3bee043e5fb5e7590098051 to a54943a045a0f86e4e3f6807d2579fca50baf4fb

[gha] Bump open-edge-platform/orch-ci/.github/workflows/post-merge.yml from 5d5d08245bb57937b3bee043e5fb5e7590098051 to a54943a045a0f86e4e3f6807d2579fca50baf4fb #1561