Bump env_logger dependency to 0.11

This requires Cargo 1.71 because of certain incompatibilities in the
Cargo manifest.

Author: djc

Cargo.toml

@@ -35,5 +35,5 @@ url = "2"
 which = "6.0"
 
 [dev-dependencies]
-env_logger = "0.10"
+env_logger = "0.11"
 tokio = { version = "1.1", features = ["macros", "parking_lot", "rt-multi-thread"] }