docs: add update notes for Version 2.6-Stable highlighting deduplicat…

…ion improvements and security enhancements

docs/updates.md

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+**Important Update Regarding HMAC File Server Version 2.6-Stable**
+
+We've identified and resolved critical issues with the deduplication processes in **Version 2.6-Stable** of the HMAC File Server. This update brings significant improvements to ensure reliable deduplication and overall server performance.
+
+**Impact:**
+- **Resolved Deduplication Issues:** The deduplication feature in **Version 2.6-Stable** has been thoroughly tested and stabilized, ensuring consistent file integrity and optimal server performance.
+- **Enhanced Stability:** Addressed previous unexpected behaviors, including lost links to files and incorrect file handling operations.
+
+**Recommended Actions:**
+- **Upgrade to Version 2.6-Stable:** If you are using any earlier version, we strongly recommend upgrading to **Version 2.6-Stable** to benefit from the latest fixes and improvements.
+- **Rollback Not Required:** Users on older releases can upgrade without the need to rollback, as **Version 2.6-Stable** resolves all critical issues present in prior versions.
+
+**What's New in Version 2.6-Stable:**
+- **Deduplication Enhancements:**
+  - **Reliable Deduplication:** Improved algorithms for accurate and efficient processing.
+  - **Performance Optimizations:** Reduced resource consumption for faster deduplication.
+- **Enhanced Features:**
+  - **Robust Malware Scanning:** Integrated advanced scanning to ensure file safety.
+  - **Enhanced Redis Support:** Improved performance with Redis for better caching.
+  - **Better Configuration Options:** More flexible settings for customization.
+- **Security Improvements:**
+  - **Strengthened Authentication Mechanisms:** Safeguards against unauthorized access.
+  - **Improved Data Encryption:** Advanced encryption standards for data at rest and in transit.
+
+**Stay Updated:**
+For detailed information on addressed issues, fixes, and enhancements introduced in **Version 2.6-Stable**, please visit our repositories:
+
+- [Git uuxo.net](https://git.uuxo.net/uuxo/hmac-file-server)
+- [GitHub](https://github.com/PlusOne/hmac-file-server)
+
+We appreciate your patience and support as we continue improving HMAC File Server. **Version 2.6-Stable** reflects our commitment to delivering a reliable and efficient file server solution. Thank you for choosing HMAC File Server!