fix(deps): update rust crate base64 to 0.21.0

Author: renovate[bot]

Cargo.lock

@@ -26,7 +26,7 @@ thiserror = "1.0"
 zip = { version = "0.6.3", default-features = false, features = ["deflate"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-base64 = "0.13.1"
+base64 = "0.21.0"
 image = { version = "0.24.4", default-features = false, features=["gif", "jpeg", "png", "bmp", "tiff"] }
 ts-rs = "6.1"