update upstream to 8.15.0

Author: Techatrix

.github/workflows/ci.yaml

@@ -14,17 +14,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        zig-version: [0.14.0]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
       - name: Setup Zig
-        uses: mlugg/setup-zig@v1
-        with:
-          version: ${{ matrix.zig-version }}
+        uses: mlugg/setup-zig@v2
 
       - name: Check Formatting
         run: zig fmt --ast-check --check .