Refactor product releases writing

Create a common function to write resulting JSON files to the releases directory.
It makes this task simpler to read and maintain, while making it modifiable at a central point in the future.
One example of such modification could be the sorting of the versions in a uniform way for all the scripts.

src/pypi.py

@@ -41,8 +41,7 @@ def update_product(product_name, configs):
         config = {"regex": REGEX} | config
         releases = releases | fetch_releases(config[METHOD], config["regex"])
 
-    with open(f"releases/{product_name}.json", "w") as f:
-        f.write(json.dumps(releases, indent=2))
+    endoflife.write_releases(product_name, releases)
 
 
 p_filter = sys.argv[1] if len(sys.argv) > 1 else None