Fix `patch` in `Cargo.toml` (#92)

Cargo.toml

@@ -60,10 +60,10 @@ ark-ff = { git = "https://github.com/arkworks-rs/algebra" }
 ark-poly = { git = "https://github.com/arkworks-rs/algebra" }
 ark-serialize = { git = "https://github.com/arkworks-rs/algebra" }
 ark-test-curves = { git = "https://github.com/arkworks-rs/algebra" }
-ark-bls12-381 = { git = "https://github.com/sunhuachuang/curves", branch = "upgrade-ff" }
-ark-bls12-377 = { git = "https://github.com/sunhuachuang/curves", branch = "upgrade-ff" }
-ark-mnt4-298 = { git = "https://github.com/sunhuachuang/curves", branch = "upgrade-ff"  }
-ark-mnt4-753 = { git = "https://github.com/sunhuachuang/curves", branch = "upgrade-ff"  }
-ark-mnt6-298 = { git = "https://github.com/sunhuachuang/curves", branch = "upgrade-ff"  }
-ark-mnt6-753 = { git = "https://github.com/sunhuachuang/curves", branch = "upgrade-ff"  }
-ark-pallas = { git = "https://github.com/sunhuachuang/curves", branch = "upgrade-ff"  }
+ark-bls12-381 = { git = "https://github.com/arkworks-rs/curves" }
+ark-bls12-377 = { git = "https://github.com/arkworks-rs/curves" }
+ark-mnt4-298 = { git = "https://github.com/arkworks-rs/curves" }
+ark-mnt4-753 = { git = "https://github.com/arkworks-rs/curves" }
+ark-mnt6-298 = { git = "https://github.com/arkworks-rs/curves" }
+ark-mnt6-753 = { git = "https://github.com/arkworks-rs/curves" }
+ark-pallas = { git = "https://github.com/arkworks-rs/curves" }