fix: pin image dependency to 0.25.10

Make the version requirement explicit to match Cargo.lock and
the ExtendedColorType API used in svg.rs.

Author: tangaac

plotters-svg/Cargo.toml

@@ -16,7 +16,7 @@ version = "0.3.6"
 path = "../plotters-backend"
 
 [dependencies.image]
-version = "0.25.9"
+version = "0.25.10"
 optional = true
 default-features = false
 features = ["jpeg", "png", "bmp"]