Fix secret used to send announcements (#821)

* Fix secret used to send announcements

* Fix matrix secret

cumulus/.github/workflows/release-01_rc-automation.yml

@@ -55,7 +55,7 @@ jobs:
         uses: s3krit/matrix-message-action@v0.0.3
         if: steps.create-issue.outputs.url != ''
         with:
-          room_id: ${{ secrets.INTERNAL_POLKADOT_MATRIX_ROOM_ID }}
+          room_id: ${{ secrets.INTERNAL_CUMULUS_MATRIX_ROOM_ID }}
           access_token: ${{ secrets.MATRIX_ACCESS_TOKEN }}
           server: "matrix.parity.io"
           message: |

cumulus/.github/workflows/release-02_create-draft.yml

@@ -200,7 +200,7 @@ jobs:
       - name: Internal polkadot channel
         uses: s3krit/matrix-message-action@v0.0.3
         with:
-          room_id: ${{ secrets.INTERNAL_POLKADOT_MATRIX_ROOM_ID }}
+          room_id: ${{ secrets.INTERNAL_CUMULUS_MATRIX_ROOM_ID }}
           access_token: ${{ secrets.MATRIX_ACCESS_TOKEN }}
           message: |
             **New draft for ${{ github.repository }}**: ${{ github.ref }}<br/>