Merge dashpay#6461: docs: update supported versions in SECURITY.md

87b3c7f docs: update supported versions in SECURITY.md (Kittywhiskers Van Gogh)

Pull request description:

  ## Additional Information

  Updates the supported versions list in `SECURITY.md`

  ## Checklist:

  - [x] I have performed a self-review of my own code **(note: N/A)**
  - [x] I have commented my code, particularly in hard-to-understand areas **(note: N/A)**
  - [x] I have added or updated relevant unit/integration/functional/e2e tests **(note: N/A)**
  - [x] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  knst:
    utACK 87b3c7f
  UdjinM6:
    utACK 87b3c7f

Tree-SHA512: 2a196b0e07e40a557f87a5137ede7d3984f14f48dedbec742e540c9ff1a9a762eccb317b35d102154745756cb83145ce5577495c2a2e581691edcfb0fa18553c

SECURITY.md

@@ -4,9 +4,8 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 21      | :white_check_mark: |
-| 20.1    | :white_check_mark: |
-| < 20.1  | :x:                |
+| 22      | :white_check_mark: |
+| < 22    | :x:                |
 
 ## Reporting a Vulnerability