fix(bdk_esplora): backport #2099 to fix no-std

Author: oleonardolima

crates/esplora/Cargo.toml

@@ -19,6 +19,7 @@ bdk_core = { path = "../core", version = "0.6.1", default-features = false }
 esplora-client = { version = "0.12.1", default-features = false }
 async-trait = { version = "0.1.66", optional = true }
 futures = { version = "0.3.26", optional = true }
+serde_json = { version = "1.0", features = ["alloc"] }
 
 [dev-dependencies]
 esplora-client = { version = "0.12.0" }

examples/example_cli/Cargo.toml

@@ -15,4 +15,4 @@ anyhow = "1"
 clap = { version = "4.5.17", features = ["derive", "env"] }
 rand = "0.8"
 serde = { version = "1", features = ["derive"] }
-serde_json = "1.0"
+serde_json = { version = "1.0", features = ["alloc"] }