fix(DB/Spell): Fix Killing Machine PPM values for ranks 3-5 (azerothcore#24866)

Co-authored-by: blinkysc <blinkysc@users.noreply.github.com>
Co-authored-by: Ariel Bastos <ariel@arielbastos.com>

Author: blinkysc

data/sql/updates/pending_db_world/rev_1771990265346528243.sql

@@ -0,0 +1,8 @@
+-- Fix Killing Machine PPM values for ranks 3-5
+-- Previous values (1, 2, 4, 6, 8) used non-linear scaling
+-- Correct values (1, 2, 3, 4, 5) use linear scaling matching tooltip
+-- Formula: attackSpeed * talentRank / 60, yielding talentRank PPM
+
+UPDATE `spell_proc` SET `ProcsPerMinute` = 3 WHERE `SpellId` = 51128; -- Killing Machine Rank 3
+UPDATE `spell_proc` SET `ProcsPerMinute` = 4 WHERE `SpellId` = 51129; -- Killing Machine Rank 4
+UPDATE `spell_proc` SET `ProcsPerMinute` = 5 WHERE `SpellId` = 51130; -- Killing Machine Rank 5