Pin Rust crate base64 to =0.22.1

Author: renovate[bot]

Cargo.toml

@@ -36,7 +36,7 @@ default-features = false
 serde_json = "=1.0.140"
 serde = { version = "=1.0.219", features = ["derive"] }
 sha2 = "=0.10.8"
-base64 = "0.22"
+base64 = "=0.22.1"
 rand = { version = "=0.8.5", default-features = true }
 criterion = { version = "=0.5.1", features = ["html_reports"] }