Enhance GitHub Actions workflow by adding vcpkg download cache preparation for Windows and macOS

- Introduced steps to prepare a download cache for vcpkg on both Windows and macOS, improving build efficiency and reducing download times.
- Ensured that the cache directories are created conditionally based on the operating system, maintaining compatibility across platforms.

.github/workflows/release.yml

@@ -184,6 +184,13 @@ jobs:
           brew install pkg-config ninja cmake
 
       # ---------- vcpkg (Windows & macOS) ----------
+      - name: Prepare vcpkg download cache (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $dl = Join-Path $env:GITHUB_WORKSPACE 'vcpkg_downloads'
+          New-Item -ItemType Directory -Force -Path $dl | Out-Null
+
       - name: Set up vcpkg (Windows)
         id: vcpkg_win
         if: runner.os == 'Windows'
@@ -216,6 +223,10 @@ jobs:
           echo "VCPKG_AVAILABLE=false" >> $env:GITHUB_ENV
           echo "YAZE_MINIMAL_BUILD=ON" >> $env:GITHUB_ENV
 
+      - name: Prepare vcpkg download cache (macOS)
+        if: runner.os == 'macOS'
+        run: mkdir -p "${{ github.workspace }}/vcpkg_downloads"
+
       - name: Set up vcpkg (macOS)
         if: runner.os == 'macOS'
         uses: lukka/run-vcpkg@v11