Merge pull request #9347 from mr-raj12/docs-update-security-md-version-table

docs: update SECURITY.md version table, fixes #9346

Author: ThomasWaldmann

SECURITY.md

@@ -6,9 +6,9 @@ These Borg releases are currently supported with security updates.
 
 | Version | Supported          |
 |---------|--------------------|
-| 2.0.x   | :x: (not released) |
+| 2.0.x   | :x: (beta)         |
 | 1.4.x   | :white_check_mark: |
-| 1.2.x   | :white_check_mark: |
+| 1.2.x   | :x: (no new releases, critical fixes may still be backported) |
 | 1.1.x   | :x:                |
 | < 1.1   | :x:                |