Add change-note

Author: mschwager

ruby/ql/lib/change-notes/2025-07-21-nethttprequest-improvements.md

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+---
+category: fix
+---
+* Made the following changes to `NetHttpRequest`
+  * Adds `connectionNode`, like other Ruby HTTP clients
+  * Makes `requestNode` and `connectionNode` public so subclasses can use them
+  * Adds detection of `Net::HTTP.start`, a common way to make HTTP requests in Ruby