Pin sub-dependecy of clap to be compatible with MSRV

Cargo.toml

@@ -46,6 +46,11 @@ serde = { version = "1.0", features = ["derive"], optional = true }
 assert_hex = "0.4.1"
 clap = { version = "3.1.6", features = ["derive"] }
 envconfig = "0.10.0"
+# TODO: Remove pinning this subdependency of clap when we are bumping our MSRV.
+# (There has been an incompatible change with the MSRV of os_str_bytes with
+# 6.6.0) Until then we are tricking the dependency resolver into using a
+# compatible version by adding it as a direct dependency here.
+os_str_bytes = ">=6.0, <6.6.0"
 rstest = { version = "0.12.0", default-features = false }
 rustversion = "1.0.16"