upgrade mpl token metadata version (#2264)

spl/Cargo.toml

@@ -26,4 +26,4 @@ serum_dex = { git = "https://github.com/project-serum/serum-dex", rev = "1be91f2
 solana-program = "1.13.3"
 spl-token = { version = "3.5.0", features = ["no-entrypoint"], optional = true }
 spl-associated-token-account = { version = "1.1.1", features = ["no-entrypoint"], optional = true }
-mpl-token-metadata = { version = "1.3.4", optional = true, features = ["no-entrypoint"] }
+mpl-token-metadata = { version = "1.4.3", optional = true, features = ["no-entrypoint"] }