CI: updated to macOS 26 + xcode 26 for runners

.github/workflows/sidestore-tests-run.yml

@@ -19,8 +19,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: 'macos-15'
-            version: '16.2'
+          - os: 'macos-26'
+            version: '26.0'
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -38,7 +38,7 @@ jobs:
       - name: Setup Xcode
         uses: maxim-lobanov/setup-xcode@v1.6.0
         with:
-          xcode-version: '16.2'
+          xcode-version: '26.0'
 
       # - name: (Tests-Run) Cache Build
       #   uses: irgaly/xcode-cache@v1.8.1