Remove temporary dependency patches

We need to enable the `legacy-api` feature of `incrementalmerkletree` to
be able to serialize note commitment trees using an old serialization
format for the `z_gettreestate` RPC.

Cargo.toml

@@ -22,7 +22,7 @@ resolver = "2"
 # `cargo release` settings
 
 [workspace.dependencies]
-incrementalmerkletree = "0.7.0"
+incrementalmerkletree = { version = "0.7.0", features = ["legacy-api"] }
 orchard = "0.9.0"
 sapling-crypto = "0.2.0"
 zcash_address = "0.5.0"
@@ -103,17 +103,3 @@ panic = "abort"
 #     - see https://doc.rust-lang.org/rustc/linker-plugin-lto.html#cc-code-as-a-dependency-in-rust
 lto = "thin"
 
-# We can remove this patches after we get out of 2.0 release candidate and upgrade the ECC dependencies above.
-# This revisions are at the commit just before setting mainnet activation heights.
-[patch.crates-io]
-zcash_address = { git = "https://github.com/zcash/librustzcash.git", rev = "1410f1449100a417bfbc4f6c7167aa9808e38792" }
-zcash_client_backend = { git = "https://github.com/zcash/librustzcash.git", rev = "1410f1449100a417bfbc4f6c7167aa9808e38792" }
-zcash_encoding = { git = "https://github.com/zcash/librustzcash.git", rev = "1410f1449100a417bfbc4f6c7167aa9808e38792" }
-zcash_history = { git = "https://github.com/zcash/librustzcash.git", rev = "1410f1449100a417bfbc4f6c7167aa9808e38792" }
-zcash_primitives = { git = "https://github.com/zcash/librustzcash.git", rev = "1410f1449100a417bfbc4f6c7167aa9808e38792" }
-zcash_proofs = { git = "https://github.com/zcash/librustzcash.git", rev = "1410f1449100a417bfbc4f6c7167aa9808e38792" }
-zcash_protocol = { git = "https://github.com/zcash/librustzcash.git", rev = "1410f1449100a417bfbc4f6c7167aa9808e38792" }
-sapling-crypto = { git = "https://github.com/zcash/sapling-crypto", rev = "b1ad3694ee13a2fc5d291ad04721a6252da0993c" }
-orchard = { git = "https://github.com/zcash/orchard", rev = "55fb089a335bbbc1cda186c706bc037073df8eb7" }
-incrementalmerkletree = { git = "https://github.com/zcash/incrementalmerkletree", rev = "ffe4234788fd22662b937ba7c6ea01535fcc1293" }
-shardtree = { git = "https://github.com/zcash/incrementalmerkletree", rev = "ffe4234788fd22662b937ba7c6ea01535fcc1293" }