Bump to 0.4.2: add zlib to conda run deps

prefix.dev rejects re-uploading 0.4.1 with a different hash, so bump
version. Adds zlib (libz.so.1 linked by IXWebSocket at runtime).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Entire-Checkpoint: e08d6e5d6273

Author: facontidavide

conda.recipe/recipe.yaml

@@ -1,5 +1,5 @@
 context:
-  version: "0.4.1"
+  version: "0.4.2"
 
 package:
   name: pj-bridge-ros2-${{ ros_distro }}
@@ -49,6 +49,7 @@ requirements:
     - ixwebsocket
     - spdlog
     - zstd
+    - zlib
 
 tests:
   - package_contents: