toolchain: update to latest nightly

Nightly builds compile with the current version release (2023-05-15). Adding `codegen-units = 1` fixes compilation errors for debug builds. See: rust-lang/compiler-builtins#523 (comment)
rmsyn · May 16, 2023 · 7aac55e · 7aac55e
1 parent 6465763
commit 7aac55e
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diff --git a/Cargo.toml b/Cargo.toml
@@ -18,6 +18,7 @@ features = ["arduino-leonardo"]
 [profile.dev]
 opt-level = "s"
 lto = true
+codegen-units = 1
 
 [profile.release]
 opt-level = "s"

diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "nightly-2023-03-24"
+channel = "nightly-2023-05-15"