Update Rust to v1.56.1 (#1431)

Some development tooling (like recent versions of cargo-deny) depends on
Rust v1.56.1. This change updates proxy build/CI to use this version for
consistency.

(cherry picked from commit 526c0df)
Signed-off-by: Oliver Gould <ver@buoyant.io>

.github/actions/package/Dockerfile

@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=rust:1.56.0-buster
+ARG BASE_IMAGE=rust:1.56.1-buster
 FROM $BASE_IMAGE
 WORKDIR /linkerd
 RUN apt-get update && \

.github/workflows/coverage.yml

@@ -11,8 +11,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     container:
-      image: docker://rust:1.56.0-buster
-      options: --security-opt seccomp=unconfined
+      image: docker://rust:1.56.1-buster
+      options: --security-opt seccomp=unconfined # 🤷
     steps:
       - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
       - run: cargo install cargo-tarpaulin

Dockerfile

@@ -17,7 +17,7 @@
 #     :; docker buildx build . --load
 
 # Please make changes via update-rust-version.sh
-ARG RUST_IMAGE=rust:1.56.0-buster
+ARG RUST_IMAGE=rust:1.56.1-buster
 
 # Use an arbitrary ~recent edge release image to get the proxy
 # identity-initializing and linkerd-await wrappers.
@@ -41,7 +41,7 @@ RUN --mount=type=cache,target=/var/lib/apt/lists \
 WORKDIR /usr/src/linkerd2-proxy
 COPY . .
 RUN --mount=type=cache,target=target \
-  --mount=type=cache,from=rust:1.56.0-buster,source=/usr/local/cargo,target=/usr/local/cargo \
+    --mount=type=cache,from=rust:1.56.1-buster,source=/usr/local/cargo,target=/usr/local/cargo \
   mkdir -p /out && \
   if [ -n "$PROXY_UNOPTIMIZED" ]; then \
   (cd linkerd2-proxy && /usr/bin/time -v cargo build --locked --features="$PROXY_FEATURES") && \

rust-toolchain

@@ -1 +1 @@
-1.56.0
+1.56.1