python-pypubsub: update to 4.0.7

- bump 4.0.3 -> 4.0.7
- add python-setuptools-scm/host to PKG_BUILD_DEPENDS
- add test.sh

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-pypubsub/test.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+[ "$1" = python3-pypubsub ] || exit 0
+
+python3 - << 'EOF'
+from pubsub import pub
+
+received = []
+
+def on_message(msg):
+    received.append(msg)
+
+pub.subscribe(on_message, "test.topic")
+pub.sendMessage("test.topic", msg="hello")
+
+assert received == ["hello"], f"Expected ['hello'], got {received}"
+
+pub.unsubscribe(on_message, "test.topic")
+pub.sendMessage("test.topic", msg="world")
+assert received == ["hello"], "Unsubscribed listener should not receive messages"
+
+print("python3-pypubsub OK")
+EOF