Apply various minor refactorings

Improve readability and fix a few Python warnings (line too long, exception too broad...) through various minor refactorings.

src/npm.py

@@ -43,10 +43,8 @@ def update_product(product_name, configs):
     endoflife.write_releases(product_name, releases)
 
 
-
-
 p_filter = sys.argv[1] if len(sys.argv) > 1 else None
 for product, configs in endoflife.list_products(METHOD, p_filter).items():
-    print("::group::%s" % product)
+    print(f"::group::{product}")
     update_product(product, configs)
     print("::endgroup::")