sdk: Use patched halo2

script/research/rln/Cargo.toml

@@ -12,3 +12,6 @@ darkfi-sdk = {path = "../../../src/sdk"}
 darkfi = {path = "../../../", features = ["zk"]}
 lazy_static = "1.4.0"
 rand = "0.8.5"
+
+[patch.crates-io]
+halo2_proofs = {git="https://github.com/parazyd/halo2", branch="vk-ser"}

src/sdk/Cargo.toml

@@ -41,3 +41,7 @@ subtle = "2.4.1"
 halo2_proofs = "0.2.0"
 halo2_gadgets = {version = "0.2.0", features = ["test-dependencies"]}
 rand = "0.8.5"
+
+[patch.crates-io]
+halo2_proofs = {git="https://github.com/parazyd/halo2", branch="vk-ser"}
+