Bump cortex-m-rt MSRV 1.39->1.40 to support non_exhaustive in cortex-m

Author: adamgreig

.github/bors.toml

@@ -5,7 +5,7 @@ status = [
   "ci-linux (stable)",
   "ci-linux (1.40.0)",
   "rt-ci-linux (stable)",
-  "rt-ci-linux (1.39.0)",
+  "rt-ci-linux (1.40.0)",
   "rt-ci-other-os (macOS-latest)",
   "rt-ci-other-os (windows-latest)",
   "rustfmt",

.github/workflows/rt-ci.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         # All generated code should be running on stable now
-        rust: [nightly, stable, 1.39.0]
+        rust: [nightly, stable, 1.40.0]
 
         include:
           # Nightly is only for reference and allowed to fail

cortex-m-rt/README.md

@@ -11,7 +11,7 @@ This project is developed and maintained by the [Cortex-M team][team].
 
 # Minimum Supported Rust Version (MSRV)
 
-This crate is guaranteed to compile on stable Rust 1.39.0 and up. It *might*
+This crate is guaranteed to compile on stable Rust 1.40.0 and up. It *might*
 compile with older versions but that may change in any new patch release.
 
 # License

cortex-m-rt/src/lib.rs

@@ -418,7 +418,7 @@
 //!
 //! # Minimum Supported Rust Version (MSRV)
 //!
-//! The MSRV of this release is Rust 1.39.0.
+//! The MSRV of this release is Rust 1.40.0.
 
 // # Developer notes
 //