Drop arm-targets down to Rust 1.59

It sounds like it might get wider use than just in here.

Author: jonathanpallant

.github/workflows/build.yml

@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        rust: [stable, 1.82]
+        rust: [stable, 1.59]
     steps:
       - name: Checkout
         uses: actions/checkout@v4

arm-targets/Cargo.toml

@@ -6,7 +6,7 @@ license = "MIT OR Apache-2.0"
 name = "arm-targets"
 readme = "README.md"
 repository = "https://github.com/rust-embedded/cortex-r.git"
-rust-version = "1.82"
+rust-version = "1.59"
 version = "0.1.0"
 
 [dependencies]