fix(ci): pin Python 3.11 on the CI

GH Actions comes with Python 3.12 by default if version 3.x specified.
`distutils` has been removed from 3.12, which causes a build problem
with `node-gyp`. This commit pins the Python version to 3.11 on the CI.

Ref: nodejs/node-gyp#2869

Closes eclipse-theia#13008

Signed-off-by: Akos Kitta <[email protected]>

.github/workflows/ci-cd.yml

@@ -26,10 +26,10 @@ jobs:
           node-version: 18.x
           registry-url: 'https://registry.npmjs.org'
 
-      - name: Use Python 3.x
+      - name: Use Python 3.11
         uses: actions/setup-python@v4
         with:
-          python-version: '3.x'
+          python-version: '3.11'
 
       - name: Install and Build
         shell: bash
@@ -67,10 +67,10 @@ jobs:
           node-version: ${{ matrix.node }}
           registry-url: 'https://registry.npmjs.org'
 
-      - name: Use Python 3.x
+      - name: Use Python 3.11
         uses: actions/setup-python@v4
         with:
-          python-version: '3.x'
+          python-version: '3.11'
 
       - name: Install
         shell: bash