Add change files to .changes directory.

Author: Themayu

.changes/14089-expose-scrollbarstyle-webview-option-to-tauri-api.md

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+---
+"@tauri-apps/api": "minor"
+---
+
+Adds the `scrollBarStyle` option to the Webview and WebviewBuilder constructors.

.changes/14089-expose-scrollbarstyle-webview-option-to-tauri-config.md

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+---
+"tauri-cli": "minor"
+"tauri-schema-generator": "minor"
+"tauri-utils": "minor"
+---
+
+Adds the `scrollBarStyle` option to the window configuration.

.changes/14089-expose-scrollbarstyle-webview-option-to-tauri.md

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+---
+"tauri-runtime-wry": "minor"
+"tauri-runtime": "minor"
+"tauri": "minor"
+---
+
+Adds the `scroll_bar_style` option to the Webview and WebviewWindow builders.
+The possible values for this option are gated behind conditional compilation
+flags, and will need to be applied using conditional compilation if customised.