Fix change note category to 'minorAnalysis'

Author: Copilot

cpp/ql/lib/change-notes/2026-07-15-cpp-regex-tree-view.md

@@ -1,4 +1,4 @@
 ---
-category: newQuery
+category: minorAnalysis
 ---
 * Added an internal C++ regular-expression parse library (`semmle.code.cpp.regex.RegexTreeView`) that implements the shared `RegexTreeViewSig` signature. This is the foundation for future ReDoS analyses for C++ (`cpp/polynomial-redos` and `cpp/redos`). No new queries are added in this release.