infra: Update to LLVM 15 for macOS release

.github/workflows/release.yml

@@ -156,11 +156,11 @@ jobs:
         with:
           global-json-file: global.json
 
-      - name: Setup LLVM 14
+      - name: Setup LLVM 15
         run: |
           wget https://apt.llvm.org/llvm.sh
           chmod +x llvm.sh
-          sudo ./llvm.sh 14
+          sudo ./llvm.sh 15
 
       - name: Install rcodesign
         run: |
@@ -215,4 +215,4 @@ jobs:
     needs: release
     with:
       ryujinx_version: "1.1.${{ github.run_number }}"
-    secrets: inherit
+    secrets: inherit