fix: MSRV to 1.71

Author: psg-19

Cargo.toml

@@ -10,7 +10,7 @@ documentation = "https://docs.rs/esplora-client/"
 description = "Bitcoin Esplora API client library. Supports plaintext, TLS and Onion servers. Blocking or async"
 keywords = ["bitcoin", "esplora"]
 readme = "README.md"
-rust-version = "1.63.0"
+rust-version = "1.70.0"
 
 [lib]
 name = "esplora_client"
@@ -23,7 +23,7 @@ hex = { version = "0.2", package = "hex-conservative" }
 log = "^0.4"
 minreq = { version = "2.11.0", features = ["json-using-serde"], optional = true }
 async_minreq = { git = "https://github.com/psg-19/async-minreq.git", default-features = false, optional = true }
-serde_json = "1.0.140"
+serde_json = "1.0.100"
 
 # default async runtime
 tokio = { version = "1", features = ["time"], optional = true }
@@ -43,7 +43,7 @@ blocking-https-native = ["blocking", "minreq/https-native"]
 blocking-https-bundled = ["blocking", "minreq/https-bundled"]
 
 tokio = ["dep:tokio"]
-async = ["async_minreq", "tokio?/time"]
+async = ["async_minreq","tokio?/time"]
 async-https = ["async"]
 async-https-native = ["async"]
 async-https-rustls = ["async"]