docs: remove duplicate/outdated Internal section from CHANGELOG

Author: ftonato

CHANGELOG

@@ -23,18 +23,6 @@ Fixes 🔨
 - Fixed build issues with rollup-plugin-typescript2/tslib compatibility
 - Fixed TypeScript 5.7 strict type checking issues
 
-Internal 🏡
-- Migrated from yarn to pnpm
-- Updated all dependencies to latest compatible versions:
-  - TypeScript: 4.3.5 → 5.7.2
-  - ESLint: 7.29.0 → 8.57.1
-  - Jest: 27.0.6 → 29.7.0 (switched from @swc-node/jest to ts-jest)
-  - Rollup: 2.52.7 → 4.28.1
-  - And many other dev dependencies
-- Updated LICENSE year to 2026
-- Removed yarn artifacts (yarn.lock, .yarn/, .yarnrc)
-- Updated README to use pnpm as primary package manager
-
 1.0.4
 
 Fixes 🔨