fix(CI): temporary fix python version for MoltenVK (#553)

Author: piiertho

.github/workflows/deploy-export-template.yaml

@@ -175,6 +175,7 @@ jobs:
 
       - name: Setup Godot dependencies
         uses: ./.github/actions/godot-deps
+
       - name: Fix scons version
         run: |
           python -m pip install scons==4.4.0
@@ -412,6 +413,11 @@ jobs:
             java-version: 11
     runs-on: ${{ matrix.os }}
     steps:
+      # To be removed when https://github.com/KhronosGroup/glslang/pull/3394 is used by MoltenVK repo.
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+
       - name: Download release informations
         uses: actions/download-artifact@v3
         with:
@@ -445,7 +451,7 @@ jobs:
         with:
           repository: KhronosGroup/MoltenVK
           path: MoltenVk
-          ref: v1.2.4
+          ref: v1.2.6
 
       - name: Build MoltenVK
         run: |