fix node link

Co-authored-by: wileyj <2847772+wileyj@users.noreply.github.com>

guides-and-tutorials/running-a-signer/README.md

@@ -306,7 +306,7 @@ For example:
 
 #### Run a Stacks Node with Docker
 
-You can run the Stacks node as a Docker container using the `blockstack/stacks-core` image, currently on [version 3.0.0.0.0.0](https://hub.docker.com/layers/blockstack/stacks-signer/3.0.0.0.0.0/images/sha256-5406912473befe62ce21f1630908b01960bae29b7bef306fd5669037ac8e112b?context=explore). When running the Docker container, you’ll need to ensure a few things:
+You can run the Stacks node as a Docker container using the `blockstack/stacks-core` image, currently on [version 3.0.0.0.0](https://hub.docker.com/layers/blockstack/stacks-core/3.0.0.0.0/images/sha256-7e0ce69dff7198ce0dd0f44676f065abd6f834ed6d9a396856a36fd422ba6134?context=repo). When running the Docker container, you’ll need to ensure a few things:
 
 - The port configured for `p2p_bind` must be exposed to the internet
 - The port configured for `rpc_bind` must be accessible by your signer