build with Python 3.11

Since our Python bindings will only work with one major.minor version of Python,
it only makes sense to use the latest available.

.github/workflows/build.yml

@@ -2,7 +2,7 @@
 # depends on pre-installed software; see image definitions:
 #  - https://github.com/actions/runner-images/blob/main/images/linux/Ubuntu2004-Readme.md
 #  - https://github.com/actions/runner-images/blob/main/images/macos/macos-12-Readme.md
-# We use these tools from the runner images: git, gcc/XCode/MSVC, python, swig, Tcl/Tk on MacOS
+# We use these tools from the runner images: git, gcc/XCode/MSVC, swig, Tcl/Tk on MacOS
 
 # TODO: not building svs_viewer ('Cannot find GL, GLU, not building svs_viewer' and 'Cannot find opengl32, glu32, not building svs_viewer')
 # TODO: not building with TCL support; need to install TCL from somewhere (maybe http://tclkits.rkeene.org/fossil/wiki/Downloads?)
@@ -28,7 +28,11 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v1
-      - name: setup Java
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+      - name: Setup Java
         uses: actions/setup-java@v3
         with:
           distribution: 'temurin'
@@ -105,7 +109,11 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v1
-      - name: setup Java
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+      - name: Setup Java
         uses: actions/setup-java@v3
         with:
           distribution: 'temurin'