Pin version of ureq to maintain our MSRV

Author: afilini

Cargo.toml

@@ -26,7 +26,7 @@ electrum-client = { version = "0.8", optional = true }
 rusqlite = { version = "0.25.3", optional = true }
 ahash = { version = "=0.7.4", optional = true }
 reqwest = { version = "0.11", optional = true, features = ["json"] }
-ureq = { version = "2.1", features = ["json"], optional = true }
+ureq = { version = "~2.2.0", features = ["json"], optional = true }
 futures = { version = "0.3", optional = true }
 async-trait = { version = "0.1", optional = true }
 rocksdb = { version = "0.14", default-features = false, features = ["snappy"], optional = true }