Don't lint autogenerated changelog file

.github/workflows/check-pushes.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install dependencies
         run: npm ci
       - name: Check files are formatted with Prettier
-        run: npx prettier --check README.md CHANGELOG.md CONTRIBUTING.md package.json "packages/**/*.{js,jsx,ts,tsx,md,mdx,json}"
+        run: npx prettier --check README.md CONTRIBUTING.md package.json "packages/**/*.{js,jsx,ts,tsx,md,mdx,json}"
       - name: Check TypeScript typings
         run: |
           cd packages/storybook-addon-designs