chore: pin base64ct as newer version is unsuported on stable

crates/cdk-cli/Cargo.toml

@@ -36,3 +36,7 @@ reqwest = { version = "0.12", default-features = false, features = [
     "socks",
 ]}
 url = "2.3"
+
+# Indirect dep
+base64ct = "=1.6.0"
+