Bump to 0.58.0

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cargo"
-version = "0.57.0"
+version = "0.58.0"
 edition = "2018"
 authors = ["Yehuda Katz <wycats@gmail.com>",
            "Carl Lerche <me@carllerche.com>",

tests/testsuite/tool_paths.rs

@@ -342,11 +342,6 @@ fn custom_linker_env() {
 
 #[cargo_test]
 fn target_in_environment_contains_lower_case() {
-    if cfg!(windows) && !cargo_test_support::is_nightly() {
-        // Remove this check when 1.55 is stabilized.
-        // https://github.com/rust-lang/rust/pull/85270
-        return;
-    }
     let p = project().file("src/main.rs", "fn main() {}").build();
 
     let target = rustc_host();