DOC-3501: Update OSS support cutoff from TinyMCE 6 to TinyMCE 7 (#4139)

Author: kemister85

modules/ROOT/partials/misc/supported-versions.adoc

@@ -31,7 +31,7 @@ Bug fixes and new features are always released in the latest version of {product
 === Security updates:
 
 * Security updates are released in the latest minor version of each major version of {productname} that is still under active premium or LTS support ({productname} {productmajorversion}, {productname} 7 and {productname} 5 LTS).
-* Security updates for the free open source edition of {productname} are issued only for around six months after the new major version is available. Security support for the free open source version of {productname} 6 ended on October 31, 2024.
+* Security updates for the free open source edition of {productname} are issued only for around six months after the new major version is available. Security support for the free open source version of {productname} 7 ended on November 11, 2025.
 * For customers with a commercial license, security support for {productname} 6 ended on June 06^th^, 2025.
 * {productname} 5 (both open source and commercial versions) is no longer receiving security updates. However, it is possible to extend security support for {productname} 5 by purchasing a dedicated LTS (Long Term Support) agreement. If you are interested in purchasing a {productname} 5 LTS license, please link:https://www.tiny.cloud/contact/[contact us].