Upgrade Rust to 1.77.0. (#206)

The release announcement is here:
  https://blog.rust-lang.org/2024/03/21/Rust-1.77.0.html

.circleci/config.yml

@@ -47,7 +47,7 @@ jobs:
             docker run --rm \
               -v $PWD:/code \
               -w /code \
-              rust:1.76.0-alpine3.19 \
+              rust:1.77.0-alpine3.19 \
                 sh -c 'apk add musl-dev && cargo run -p package -- dist'
       - persist_to_workspace:
           root: dist

.github/workflows/ci.yml

@@ -48,7 +48,7 @@ jobs:
           docker run --rm \
             -v $PWD:/code \
             -w /code \
-            rust:1.76.0-alpine3.19 \
+            rust:1.77.0-alpine3.19 \
               sh -c 'apk add musl-dev && cargo run -p package'
       - name: Integration Tests
         run: examples/run.sh --no-package

.github/workflows/release.yml

@@ -64,7 +64,7 @@ jobs:
           docker run --rm \
             -v $PWD:/code \
             -w /code \
-            rust:1.76.0-alpine3.19 \
+            rust:1.77.0-alpine3.19 \
               sh -c 'apk add musl-dev && cargo run -p package -- dist'
       - name: Prepare Changelog
         id: prepare-changelog

rust-toolchain

@@ -2,7 +2,7 @@
 # N.B.: Update .github and .circleci yaml to use a matching image, if available.
 # Although a version match is not required (cargo downloads and installs the
 # toolchain described here if not present), it does speed up CI builds.
-channel = "1.76.0"
+channel = "1.77.0"
 components = [
   "cargo",
   "clippy",