Update to base64 0.20 (#1641)

Author: Austaras

axum/Cargo.toml

@@ -53,7 +53,7 @@ tower-service = "0.3"
 
 # optional dependencies
 axum-macros = { path = "../axum-macros", version = "0.3.0", optional = true }
-base64 = { version = "0.13", optional = true }
+base64 = { version = "0.20", optional = true }
 headers = { version = "0.3.7", optional = true }
 multer = { version = "2.0.0", optional = true }
 serde_json = { version = "1.0", features = ["raw_value"], optional = true }