[gha] bump open-edge-platform/orch-ci/.github/workflows/post-merge.yml from 072332a8215754f6496bf97c8f3c7559dba5fdc1 to a54943a045a0f86e4e3f6807d2579fca50baf4fb

[gha] bump open-edge-platform/orch-ci/.github/workflows/post-merge.yml from 072332a8215754f6496bf97c8f3c7559dba5fdc1 to a54943a045a0f86e4e3f6807d2579fca50baf4fb #770