Pin NSC promotion actions

Author: AnastaZIuk

.github/workflows/promote-nsc-channel.yml

@@ -51,7 +51,7 @@ jobs:
 
     steps:
       - name: Checkout target branch
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
         with:
           repository: ${{ inputs.target_repo }}
           ref: ${{ inputs.target_branch }}
@@ -100,7 +100,7 @@ jobs:
           } >> "${GITHUB_OUTPUT}"
 
       - name: Download NSC payload artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093
         with:
           run-id: ${{ inputs.run_id }}
           name: ${{ inputs.channel }}-payload
@@ -109,7 +109,7 @@ jobs:
           repository: ${{ inputs.source_repo }}
 
       - name: Download NSC manifests artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093
         with:
           run-id: ${{ inputs.run_id }}
           name: ${{ inputs.channel }}-manifests