message: doc: Add explicit macdeployqtplus dependencies install step
  This change is required on macOS 11 Big Sur.
diff: @@ -30,6 +30,11 @@ If you want to build the disk image with `make deploy` (.dmg / optional), you ne
  brew install librsvg
  ```
  +and [`macdeployqtplus`](../contrib/macdeploy/README.md) dependencies:
  +```shell
  +pip3 install ds_store mac_alias
  +```
  +
  The wallet support requires one or both of the dependencies ([*SQLite*](#sqlite) and [*Berkeley DB*](#berkeley-db)) in the sections below.
  To build Bitcoin Core without wallet, see [*Disable-wallet mode*](#disable-wallet-mode).
  