[amazon-neptune] Update script to rely on documentation (#519)

Use https://docs.aws.amazon.com/neptune/latest/userguide/toc-contents.json instead of https://docs.aws.amazon.com/neptune/latest/userguide/rssupdates.rss for automation, as it contains a longer versions history.

src/amazon-neptune.py

@@ -1,23 +1,26 @@
-import logging
+import re
 
 from common import dates, http
 from common.releasedata import ProductData, config_from_argv
 
 """Fetches Amazon Neptune versions from its RSS feed on docs.aws.amazon.com."""
 
+REGEX = r"(Maintenance r|R)elease:? (?P<version>.+) \((?P<date>\d+-\d+-\d+)\)"
+
+def parse(data: dict, product: ProductData) -> None:
+    if "title" in data:
+        title = data["title"]
+        print(title)
+        match = re.search(REGEX, title)
+        if match:
+            name = match.group("version")
+            date = dates.parse_date(match.group("date"))
+            product.declare_version(name, date)
+
+    for item in data.get("contents", []):
+        parse(item, product)
+
 config = config_from_argv()
 with ProductData(config.product) as product_data:
-    rss = http.fetch_xml(config.url)
-
-    for entry in rss.getElementsByTagName("item"):
-        version_str = entry.getElementsByTagName("title")[0].firstChild.nodeValue
-        date_str = entry.getElementsByTagName("pubDate")[0].firstChild.nodeValue
-
-        version_match = config.first_match(version_str)
-        if not version_match:
-            logging.warning(f"Skipping entry with malformed version: {version_str}")
-            continue
-
-        version = config.render(version_match)
-        date = dates.parse_datetime(date_str)
-        product_data.declare_version(version, date)
+    json = http.fetch_json(config.url)
+    parse(json, product_data)