Update libwebp dependency (fix #208)

Author: atrifat

config/source.json

@@ -241,7 +241,7 @@
     },
     "libwebp": {
         "type": "url",
-        "url": "https://github.com/webmproject/libwebp/archive/refs/tags/v1.3.0.tar.gz",
+        "url": "https://github.com/webmproject/libwebp/archive/refs/tags/v1.3.2.tar.gz",
         "license": {
             "type": "file",
             "path": "COPYING"