Make bytesize dependency optional

It's only used with `upload` feature

Cargo.toml

@@ -21,7 +21,6 @@ name = "maturin"
 [dependencies]
 anyhow = "1.0.51"
 base64 = "0.13.0"
-bytesize = "1.0.1"
 glob = "0.3.0"
 cargo_metadata = "0.15.0"
 cargo-options = "0.3.1"
@@ -62,6 +61,7 @@ clap = { version = "3.1.14", features = ["derive", "env", "wrap_help"] }
 clap_complete = "3.1.3"
 clap_complete_fig = "3.1.0"
 # upload
+bytesize = { version = "1.0.1", optional = true }
 configparser = { version = "3.0.0", optional = true }
 multipart = { version = "0.18.0", features = ["client"], default-features = false, optional = true }
 rpassword = { version = "7.0.0", optional = true }
@@ -75,7 +75,7 @@ indoc = "1.0.3"
 
 [features]
 default = ["log", "upload", "rustls", "human-panic"]
-upload = ["ureq", "multipart", "rpassword", "configparser"]
+upload = ["ureq", "multipart", "rpassword", "configparser", "bytesize"]
 password-storage = ["upload", "keyring"]
 log = ["pretty_env_logger"]
 rustls = ["ureq/tls", "cargo-xwin/rustls-tls"]