Pin reqwest and tokio version for msrv

Cargo.toml

@@ -40,7 +40,7 @@ serialport = { version = "4.3", optional = true }
 serde = { version = "1.0", features = ["derive"], optional = true }
 serde_bytes = { version = "0.11.14", optional = true }
 serde_cbor = { version = "0.11", optional = true }
-reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls"] , optional = true}
+reqwest = { version = "0.11.0", default-features = false, features = ["json", "rustls-tls"] , optional = true}
 
 # bitbox
 bitbox-api = { version = "0.2.3", default-features = false, features = ["usb", "tokio", "multithreaded"], optional = true }
@@ -62,7 +62,7 @@ hidapi = { version = "2.5.1", features = ["linux-static-hidraw"], default-featur
 regex = { version = "1.6.0", optional = true }
 
 # jade & specter & ledger & bitbox
-tokio = { version = "1.21.0", features = ["net", "time", "io-util", "sync", "macros"], optional = true }
+tokio = { version = "=1.21", features = ["net", "time", "io-util", "sync", "macros"], optional = true }
 
 [dev-dependencies]
 tokio = { version = "1.21", features = ["macros", "net", "rt", "rt-multi-thread", "io-util", "sync"] }