Bump to 0.45.0.

Author: ehuss

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cargo"
-version = "0.44.0"
+version = "0.45.0"
 edition = "2018"
 authors = ["Yehuda Katz <[email protected]>",
            "Carl Lerche <[email protected]>",

tests/testsuite/check.rs

@@ -5,7 +5,7 @@ use std::fmt::{self, Write};
 use cargo_test_support::install::exe;
 use cargo_test_support::paths::CargoPathExt;
 use cargo_test_support::registry::Package;
-use cargo_test_support::{basic_manifest, is_nightly, project};
+use cargo_test_support::{basic_manifest, project};
 
 #[cargo_test]
 fn check_success() {
@@ -683,11 +683,6 @@ fn check_artifacts() {
 
 #[cargo_test]
 fn short_message_format() {
-    if !is_nightly() {
-        // This relies on a bug fix https://github.com/rust-lang/rust/pull/64753.
-        // This check may be removed once 1.40 is stable.
-        return;
-    }
     let foo = project()
         .file("src/lib.rs", "fn foo() { let _x: bool = 'a'; }")
         .build();