Update change note

Author: tausbn

python/ql/lib/change-notes/2026-02-18-remove-points-to-from-metrics.md

@@ -1,5 +1,5 @@
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-category: minorAnalysis
+category: breaking
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 - The `Metrics` library no longer contains code that depends on the points-to analysis. The removed functionality has instead been moved to the `LegacyPointsTo` module, to classes like `ModuleMetricsWithPointsTo` etc. If you depend on any of these classes, you must now remember to import `LegacyPointsTo`, and use the appropriate types in order to use the points-to-based functionality.