build: build on python 3.12 (#266)

Signed-off-by: Phil Adams <[email protected]>

Author: padamstx

.travis.yml

@@ -5,9 +5,9 @@ language: python
 matrix:
   include:
     - python: 3.8
-    - python: 3.9
     - python: 3.10
     - python: 3.11
+    - python: 3.12
 
 cache: pip