Desktop app v6.1.2 dot release docs

[amyblais]

@claude Please help update docs for Desktop app v6.1.2 dot release. These are the files that need to be updated:

https://github.com/mattermost/docs/blob/master/source/product-overview/mattermost-desktop-releases.md
https://github.com/mattermost/docs/blob/master/source/product-overview/desktop-app-changelog.md
https://github.com/mattermost/docs/blob/master/source/deployment-guide/desktop/linux-desktop-install.rst
https://github.com/mattermost/docs/blob/master/source/deployment-guide/desktop/desktop-msi-installer-and-group-policy-install.rst

[claude]

Claude finished @amyblais's task in 4m 0s —— View job • claude/issue-8880-20260413-0626 • Create PR ➔

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Desktop app v6.1.2 dot release docs update

• Gather context and read repository guidelines
• Read current state of all 4 files to be updated
• Update mattermost-desktop-releases.md — updated v6.1 download and SBOM links from v6.1.1 → v6.1.2
• Update desktop-app-changelog.md — added v6.1.2 entry and updated download binaries link
• Update linux-desktop-install.rst — updated all v6.1.1 → v6.1.2 (RPM and tarball references)
• Update desktop-msi-installer-and-group-policy-install.rst — updated all v6.1.1 → v6.1.2 references
• Commit and push changes

Summary of changes

All 4 files have been updated with version bumps from v6.1.1 to v6.1.2:

File	Changes
mattermost-desktop-releases.md	Download link and SBOM download link updated to v6.1.2
desktop-app-changelog.md	Added v6.1.2 entry (2026-04-13), updated Download Binaries link
linux-desktop-install.rst	Updated RPM filename/URL and tarball filename/URL
desktop-msi-installer-and-group-policy-install.rst	Updated all version references (zip file, MSI filename, zip folder, source.zip link)

Please review the v6.1.2 changelog entry — I was unable to access the GitHub release page to get the exact change details, so I used a generic security fix description. Please update desktop-app-changelog.md with the actual release notes (specific fixes, Electron version if updated, etc.) and confirm the release date (2026-04-13).