message: Update contributors table and supported releases for v12.3.0
diff: @@ -15,8 +15,8 @@ We provide security patches for the latest released minor version.
  | Version | Supported |
  |:--------|:-------------------|
  -| 12.2.x | :white_check_mark: |
  -| <12.2 | :x: |
  +| 12.3.x | :white_check_mark: |
  +| <12.3 | :x: |
  ## Reporting a Vulnerability
  @@ -28,4 +28,3 @@ contact our shop's "security team" at the address mentioned in our
  > Instead of fixing reported vulnerabilities we might turn them into
  > hacking challenges! You might receive a reward for reporting a
  > vulnerability that makes it into one of our challenges!
  -
  