feat: replace webp lib by C libwebp

Avoid having to download anything

.github/workflows/test.yml

@@ -17,6 +17,9 @@ jobs:
         with:
           go-version: '1.23'
 
+      - name: Install libwebp-dev
+        run: sudo apt-get install -y libwebp-dev
+
       - name: Install dependencies
         run: go mod tidy