Desktop v5.13.4 docs (#8698)

* Update mattermost-desktop-releases.md

* Update desktop-app-changelog.md

Author: amyblais

source/product-overview/desktop-app-changelog.md

@@ -103,6 +103,10 @@ Mattermost Desktop App v6.0.0 contains low severity level security fixes. Upgrad
 (release-v5-13)=
 ## Release v5.13 (Extended Support Release)
 
+- **v5.13.4, released 2026-01-29**
+
+  - Mattermost Desktop App v5.13.4 contains a medium severity level security fix. Upgrading is recommended. Details will be posted on our [security updates page](https://mattermost.com/security-updates/) 30 days after release as per the [Mattermost Responsible Disclosure Policy](https://mattermost.com/security-vulnerability-report/).
+
 - **v5.13.3, released 2026-01-22**
 
   - Mattermost Desktop App v5.13.3 contains low to high severity level security fixes. Upgrading is recommended. Details will be posted on our [security updates page](https://mattermost.com/security-updates/) 30 days after release as per the [Mattermost Responsible Disclosure Policy](https://mattermost.com/security-vulnerability-report/).

source/product-overview/mattermost-desktop-releases.md

@@ -19,7 +19,7 @@ Mattermost releases a new desktop app version every 4 months, in February, May,
 | **Release** | **Support** | **Compatible with** |
 |:---|:---|:---|
 | v6.0 [Download](https://github.com/mattermost/desktop/releases/tag/v6.0.4) \| {ref}`Changelog <release-v6-0>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v6.0.4/sbom-desktop-v6.0.4.json) | Released: 2025-11-14<br/>Support Ends: 2026-02-15 | {ref}`v11.3 <release-v11.3-feature-release>`, {ref}`v11.2 <release-v11.2-feature-release>`, {ref}`v11.1 <release-v11.1-feature-release>`, {ref}`v11.0 <release-v11.0-major-release>`, {ref}`v10.12 <release-v10.12-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>` |
-| v5.13 [Download](https://github.com/mattermost/desktop/releases/tag/v5.13.3) \| {ref}`Changelog <release-v5-13>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v5.13.3/sbom-desktop-v5.13.3.json) | Released: 2025-08-15<br/>Support Ends: 2026-08-15 {ref}`EXTENDED <release-types>` | {ref}`v11.0 <release-v11.0-major-release>`, {ref}`v10.12 <release-v10.12-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>`, {ref}`v10.10 <release-v10.10-feature-release>`, {ref}`v10.9 <release-v10.9-feature-release>`, {ref}`v10.5 <release-v10.5-extended-support-release>` |
+| v5.13 [Download](https://github.com/mattermost/desktop/releases/tag/v5.13.4) \| {ref}`Changelog <release-v5-13>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v5.13.4/sbom-desktop-v5.13.4.json) | Released: 2025-08-15<br/>Support Ends: 2026-08-15 {ref}`EXTENDED <release-types>` | {ref}`v11.0 <release-v11.0-major-release>`, {ref}`v10.12 <release-v10.12-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>`, {ref}`v10.10 <release-v10.10-feature-release>`, {ref}`v10.9 <release-v10.9-feature-release>`, {ref}`v10.5 <release-v10.5-extended-support-release>` |
 | v5.12 [Download](https://github.com/mattermost/desktop/releases/tag/v5.12.1) \| {ref}`Changelog <release-v5-12>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v5.12.1/sbom-desktop-v5.12.1.json) | Released: 2025-05-16<br/>Support Ends: 2025-08-15 | {ref}`v10.10 <release-v10.10-feature-release>`, {ref}`v10.9 <release-v10.9-feature-release>`, {ref}`v10.8 <release-v10.8-feature-release>`, {ref}`v10.7 <release-v10.7-feature-release>`, {ref}`v10.6 <release-v10.6-feature-release>`, {ref}`v10.5 <release-v10.5-extended-support-release>` |
 | v5.11 [Download](https://github.com/mattermost/desktop/releases/tag/v5.11.3) \| {ref}`Changelog <release-v5-11>` | Released: 2025-02-14<br/>Support Ends: 2025-11-15 | {ref}`v10.7 <release-v10.7-feature-release>`, {ref}`v10.6 <release-v10.6-feature-release>`, {ref}`v10.5 <release-v10.5-extended-support-release>`, {ref}`v10.4 <release-v10.4-feature-release>`, {ref}`v10.3 <release-v10.3-feature-release>`, {ref}`v9.11 <release-v9-11-extended-support-release>` |
 | v5.10 [Download](https://github.com/mattermost/desktop/releases/tag/v5.10.2) \| {ref}`Changelog <release-v5-10>` | Released: 2024-11-15<br/>Support Ends: 2025-02-13 | {ref}`v10.2 <release-v10.2-feature-release>`, {ref}`v10.1 <release-v10.1-feature-release>`, {ref}`v10.0 <release-v10.0-major-release>`, {ref}`v9.11 <release-v9-11-extended-support-release>`, {ref}`v9.5 <release-v9-5-extended-support-release>` |