ci: refresh distros - drop Debian Stretch, add Ubuntu and Fedora

Drop Debian Stretch:

  Err:6 http://deb.debian.org/debian stretch-updates Release
    404  Not Found
  E: The repository 'http://deb.debian.org/debian stretch Release' does not have a Release file.
  E: The repository 'http://security.debian.org/debian-security stretch/updates Release' does not have a Release file.
  E: The repository 'http://deb.debian.org/debian stretch-updates Release' does not have a Release file.

Add Ubuntu Lunar and Fedora 38 and 39.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>