Upgrade Rust to 1.72.0. (#131)

The release announcement is here:
https://blog.rust-lang.org/2023/08/24/Rust-1.72.0.html

.circleci/config.yml

@@ -47,7 +47,7 @@ jobs:
             docker run --rm \
               -v $PWD:/code \
               -w /code \
-              rust:1.71.1-alpine3.18 \
+              rust:1.72.0-alpine3.18 \
                 sh -c 'apk add musl-dev && cargo run -p package -- dist'
       - persist_to_workspace:
           root: dist

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
           docker run --rm \
             -v $PWD:/code \
             -w /code \
-            rust:1.71.1-alpine3.18 \
+            rust:1.72.0-alpine3.18 \
               sh -c 'apk add musl-dev && cargo run -p package'
       - name: Integration Tests
         run: examples/run.sh --no-package

.github/workflows/release.yml

@@ -62,7 +62,7 @@ jobs:
           docker run --rm \
             -v $PWD:/code \
             -w /code \
-            rust:1.71.1-alpine3.18 \
+            rust:1.72.0-alpine3.18 \
               sh -c 'apk add musl-dev && cargo run -p package -- dist'
       - name: Prepare Changelog
         id: prepare-changelog

package/src/main.rs

@@ -159,7 +159,7 @@ fn main() -> ExitResult {
             // N.B.: This just suppresses a warning about adding this bin dir to your PATH.
             .env(
                 "PATH",
-                vec![output_bin_dir.to_str().unwrap(), env!("PATH")].join(PATHSEP),
+                [output_bin_dir.to_str().unwrap(), env!("PATH")].join(PATHSEP),
             ),
     )?;
 

rust-toolchain

@@ -1,6 +1,6 @@
 [toolchain]
 # N.B.: Update .github and .circleci yaml to use a matching image.
-channel = "1.71.1"
+channel = "1.72.0"
 components = [
   "cargo",
   "clippy",