[Release][doc] Add release notes for version 2.1.7.

Author: GOODBOY008

src/pages/download/release-note/2.1.7.md

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+## Release Notes 2.1.7
+
+<div style={{height: '30px'}}></div>
+
+Apache StreamPark 2.1.7 includes several improvements and bug fixes.
+This release enhances the stability, security, and user experience of the platform.
+It's recommended that users upgrade to this version.
+
+<div style={{height: '30px'}}></div>
+
+### Features
+---
+- N.A
+
+### Bugfix
+---
+- Fixed an issue with retrieving Flink configuration files.
+
+### Improvements
+---
+- Enhanced MavenUtils license header for better consistency.
+- Improved Maven arguments validation for more robust build handling.
+- Refined login authentication process for increased security and reliability.
+
+### Acknowledgements
+---
+Thanks contributors, users, etc. related with the work of the new version for the efforts.
+
+**Full Changelog**: https://github.com/apache/streampark/compare/v2.1.6...v2.1.7