lang: Pin zeroize to 1.3.0 (#539)

lang/Cargo.toml

@@ -36,3 +36,9 @@ borsh = "0.9"
 bytemuck = "1.4.0"
 solana-program = "1.7.4"
 thiserror = "1.0.20"
+
+#
+# Needed to prevent the build from failing. This is a transitive dependency of
+# solana-program.
+#
+zeroize = "=1.3.0"