Update Rust crate base64 to 0.21.7 (#1135)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Cargo.toml

@@ -35,7 +35,7 @@ anyhow = "1"
 async-recursion = "1.0.5"
 async-trait = "0.1.77"
 atty = "0.2.14"
-base64 = "0.21.5"
+base64 = "0.21.7"
 bincode = "1.3"
 byte-unit = "5.1.2"
 bytes = { version = "1", features = ["serde"] }