chore: update examples to use python 3.12 (#1919)

examples/travis-ci-deploy.yml

@@ -4,7 +4,7 @@
 os: linux
 dist: focal
 language: python
-python: "3.9"
+python: "3.12"
 
 jobs:
   include:
@@ -14,10 +14,10 @@ jobs:
     - os: windows
       language: shell
       before_install:
-        - choco upgrade python -y --version 3.8.6
-        - export PATH="/c/Python38:/c/Python38/Scripts:$PATH"
+        - choco upgrade python -y --version 3.12.4
+        - export PATH="/c/Python312:/c/Python312/Scripts:$PATH"
         # make sure it's on PATH as 'python3'
-        - ln -s /c/Python38/python.exe /c/Python38/python3.exe
+        - ln -s /c/Python312/python.exe /c/Python312/python3.exe
 
 install:
   - python3 -m pip install cibuildwheel==2.19.2