Adding Open Systems as an adopter (thanos-io#6136)

Signed-off-by: Dominik Jäger <[email protected]>
Signed-off-by: Dominik Jäger <[email protected]>
Co-authored-by: Dominik Jäger <[email protected]>

Author: domjaeg

website/data/adopters.yml

@@ -210,3 +210,6 @@ adopters:
 - name: Grupo MasMovil
   url: https://grupomasmovil.com/en/
   logo: gmasmovil.png
+- name: Open Systems
+  url: https://www.open-systems.com
+  logo: open-systems.png