Dot release docs for server v11.4.3, v11.3.3, v10.11.13

[amyblais]

@claude Please prepare dot release docs for server v11.4.3, v11.3.3, v10.11.13.

These are the docs to update:

https://github.com/mattermost/docs/blob/master/source/deployment-guide/server/linux/deploy-rhel.rst
https://github.com/mattermost/docs/blob/master/source/deployment-guide/server/linux/deploy-tar.rst
https://github.com/mattermost/docs/blob/master/source/product-overview/mattermost-server-releases.md
https://github.com/mattermost/docs/blob/master/source/product-overview/mattermost-v10-changelog.md
https://github.com/mattermost/docs/blob/master/source/product-overview/mattermost-v11-changelog.md
https://github.com/mattermost/docs/blob/master/source/product-overview/version-archive.rst (both enterprise and team edition)

[claude]

Claude finished @amyblais's task in 4m 45s —— View job • claude/issue-8791-20260306-0917 • Create PR ➔

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Preparing dot release docs for v11.4.3, v11.3.3, v10.11.13

• Gather context and read files
• Update deploy-rhel.rst with new version numbers
• Update deploy-tar.rst with new version numbers
• Update mattermost-server-releases.md with new releases
• Update mattermost-v10-changelog.md with v10.11.13 entry
• Update mattermost-v11-changelog.md with v11.4.3 and v11.3.3 entries
• Update version-archive.rst (enterprise and team edition) with new versions
• Commit and push changes

Summary

All 6 files have been updated for the v11.4.3, v11.3.3, and v10.11.13 dot releases:

• deploy-rhel.rst and deploy-tar.rst: Updated latest release (11.4.2 → 11.4.3) and current ESR (10.11.12 → 10.11.13) download URLs
• mattermost-server-releases.md: Updated download links and SBOM links for v11.4, v11.3, and v10.11
• mattermost-v11-changelog.md: Added changelog entries for v11.4.3 and v11.3.3 (released 2026-03-06)
• mattermost-v10-changelog.md: Added changelog entry for v10.11.13 (released 2026-03-06)
• version-archive.rst: Added new entries for v11.4.3, v11.3.3, and v10.11.13 for both Enterprise and Team Editions; old entries for v11.4.2, v11.3.2, and v10.11.12 are retained

Action required before merging: The SHA-256 checksums in version-archive.rst are marked as <SHA256_CHECKSUM> placeholders — these need to be replaced with the actual checksums from the release artifacts. The changelog entries also use a generic "medium severity level security fix" description that may need to be updated with the actual release notes.