fix(amazonq): update mynah-ui v 4.15.8 aws#5497

## Problem
New version of MynahUI requires release in vscode.

## Solution
Release new version of MynahUI with the following bug fixes:
- Fix copy pasting inline code texts
aws/mynah-ui#98
- Fix disabled commands not filtered in quick actions

MynahUI v4.15.8 release notes:
https://github.com/aws/mynah-ui/releases/tag/v4.15.8

Author: rahmaniaam

package-lock.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "Fix bug where text with inline code copied from Amazon Q Chat had new line breaks around the inline code text"
+}

packages/amazonq/.changes/next-release/Bug Fix-7386c56a-07b9-4c6e-98f2-4321ec9cea28.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "Fix bug when disabled commands does not get filtered in quick actions"
+}

packages/amazonq/.changes/next-release/Bug Fix-7ab2c6fa-1678-4834-8edd-80eb2c12953e.json

@@ -4111,7 +4111,7 @@
         "@aws-sdk/property-provider": "3.46.0",
         "@aws-sdk/smithy-client": "^3.46.0",
         "@aws-sdk/util-arn-parser": "^3.46.0",
-        "@aws/mynah-ui": "^4.15.7",
+        "@aws/mynah-ui": "^4.15.8",
         "@gerhobbelt/gitignore-parser": "^0.2.0-9",
         "@iarna/toml": "^2.2.5",
         "@smithy/middleware-retry": "^2.3.1",