chore(cargo): update image crate to 0.25.2

This version deprecated `image::io::Reader`,
requires changes to avoid warnings.

src/blob.rs

@@ -12,7 +12,7 @@ use anyhow::{format_err, Context as _, Result};
 use base64::Engine as _;
 use futures::StreamExt;
 use image::codecs::jpeg::JpegEncoder;
-use image::io::Reader as ImageReader;
+use image::ImageReader;
 use image::{DynamicImage, GenericImage, GenericImageView, ImageFormat, Pixel, Rgba};
 use num_traits::FromPrimitive;
 use tokio::io::AsyncWriteExt;