message: Update OS support for self-hosted runners in README
diff: @@ -82,12 +82,11 @@ Both `GitHub-hosted` and `self-hosted` runners are supported by `setup-php` on t
  | Host OS/Virtual environment | YAML workflow label |
  |----------------------------------|----------------------------|
  -| Ubuntu 21.04 | `self-hosted` or `Linux` |
  +| Ubuntu 22.04 | `self-hosted` or `Linux` |
  | Ubuntu 20.04 | `self-hosted` or `Linux` |
  | Ubuntu 18.04 | `self-hosted` or `Linux` |
  | Debian 11 | `self-hosted` or `Linux` |
  | Debian 10 | `self-hosted` or `Linux` |
  -| Debian 9 | `self-hosted` or `Linux` |
  | Windows 7 and newer | `self-hosted` or `Windows` |
  | Windows Server 2012 R2 and newer | `self-hosted` or `Windows` |
  | macOS Monterey 12.x x86_64/arm64 | `self-hosted` or `macOS` |
  