CI: install xcodes from upstream tap (#520)

Author: davdroman

.github/workflows/ci.yml

@@ -54,6 +54,11 @@ jobs:
       - name: Git Checkout
         uses: actions/checkout@v5
 
+      - name: Install xcodes
+        run: |
+          brew uninstall xcodes
+          brew install xcodesorg/made/xcodes
+
       - name: Select Xcode
         run: sudo xcodes select ${{ matrix.xcode || '26.6' }}
 
@@ -133,6 +138,11 @@ jobs:
       - name: Git Checkout
         uses: actions/checkout@v5
 
+      - name: Install xcodes
+        run: |
+          brew uninstall xcodes
+          brew install xcodesorg/made/xcodes
+
       - name: Select Xcode
         run: sudo xcodes select 26.6