fix: add missing dependency for qvm-connect-tcp

The target of qubes.ConnectTCP has 'socat' because it is a dependency of
qubes-core-agent-networking. In case the target has not networking
packages, this needs to be taken care by the formula that creates the
target, not from the client itself.

salt/electrum/install.sls

@@ -30,6 +30,7 @@ include:
     - install_recommends: False
     - skip_suggestions: True
     - pkgs:
+      - socat
       ## Unlisted dependency.
       - python3-jsonpatch
       ## Dependencies retrieved from 'electrum' and 'python3-electrum' pkg.

salt/sys-electrs/install-source.sls

@@ -28,6 +28,7 @@ include:
     - install_recommends: False
     - skip_suggestions: True
     - pkgs:
+      - socat
       - librocksdb-dev
       - man-db
 

salt/sys-electrumx/install.sls

@@ -26,6 +26,7 @@ include:
     - install_recommends: False
     - skip_suggestions: True
     - pkgs:
+      - socat
       - python3-aiohttp
       - python3-aiorpcx
       - python3-attr