feat: Add milestone R9 (#337)

Signed-off-by: Jan Schoone <[email protected]>
Co-authored-by: Felix Kronlage-Dammers <[email protected]>

Author: jschoone

config.yaml

@@ -1,12 +1,13 @@
 ---
 milestones:
-  - 'R2 (v3.0.0)'
-  - 'R3 (v4.0.0)'
-  - 'R4 (v5.0.0)'
-  - 'R5 (v6.0.0)'
-  - 'R6 (v7.0.0)'
-  - 'R7 (v8.0.0)'
-  - 'R8 (v9.0.0)'
+  - "R2 (v3.0.0)"
+  - "R3 (v4.0.0)"
+  - "R4 (v5.0.0)"
+  - "R5 (v6.0.0)"
+  - "R6 (v7.0.0)"
+  - "R7 (v8.0.0)"
+  - "R8 (v9.0.0)"
+  - "R9 (v10.0.0)"
 
 labels:
   - name: bug