chore: Remove serde dependency

rust-elements has the default feature "json-contract" which depends on
serde_json. We don't need this feature in rust-simplicity.

Cargo-recent.lock

@@ -127,7 +127,6 @@ dependencies = [
  "bitcoin",
  "secp256k1-zkp",
  "serde",
- "serde_json",
 ]
 
 [[package]]
@@ -175,12 +174,6 @@ dependencies = [
  "rustc_version",
 ]
 
-[[package]]
-name = "itoa"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
-
 [[package]]
 name = "js-sys"
 version = "0.3.70"
@@ -208,12 +201,6 @@ version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
-[[package]]
-name = "memchr"
-version = "2.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
-
 [[package]]
 name = "memmap2"
 version = "0.9.5"
@@ -320,12 +307,6 @@ dependencies = [
  "semver",
 ]
 
-[[package]]
-name = "ryu"
-version = "1.0.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3cb5ba0dc43242ce17de99c180e96db90b235b8a9fdc9543c96d2209116bd9f"
-
 [[package]]
 name = "santiago"
 version = "1.3.1"
@@ -405,18 +386,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "serde_json"
-version = "1.0.128"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ff5456707a1de34e7e37f2a6fd3d3f808c318259cbd01ab6377795054b483d8"
-dependencies = [
- "itoa",
- "memchr",
- "ryu",
- "serde",
-]
-
 [[package]]
 name = "simpcli"
 version = "0.3.0"

Cargo.toml

@@ -24,7 +24,7 @@ path = "src/lib.rs"
 bitcoin = { version = "0.32.0", optional = true }
 bitcoin-miniscript = { package = "miniscript", version = "12.0.0" }
 byteorder = "1.3"
-elements = { version = "0.25.0", optional = true }
+elements = { version = "0.25.0", optional = true, default-features = false }
 hashes = { package = "bitcoin_hashes", version = "0.14" }
 hex = { package = "hex-conservative", version = "0.1.1" }
 santiago = "1.3"