python-jsonschema: Update to 4.19.1, update list of dependencies

This also adds a test.sh script for the packages feed CI.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python-jsonschema/test.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+[ "$1" = python3-jsonschema ] || exit 0
+
+python3 - << 'EOF'
+
+from jsonschema import validate
+
+# A sample schema, like what we'd get from json.load()
+schema = {
+    "type" : "object",
+    "properties" : {
+        "price" : {"type" : "number"},
+        "name" : {"type" : "string"},
+    },
+}
+
+# If no exception is raised by validate(), the instance is valid.
+validate(instance={"name" : "Eggs", "price" : 34.99}, schema=schema)
+
+EOF