Upgrade to Rust 1.81

Summary:
Rust 1.81 introduced new [lifetime rules](rust-lang/rust#117967), which opaque-ke, a crate we depend on, violated. The maintainers of that crate have introduced a new version that satisifies these new rules, and we have upgraded to this version in D13895. Now that we've upgraded the dependency, we should bump Rust to the latest stable version.

EDIT: we can't upgrade to 1.82, the latest stable version, because of an issue with `wasm-bindgen`: https://linear.app/comm/issue/ENG-9892/cant-upgrade-to-rust-182

Depends on D13895

Test Plan: All crates build locally and in Docker (CI)

Reviewers: will, bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13896

keyserver/Dockerfile

@@ -88,7 +88,7 @@ RUN mkdir /home/comm/backups
 
 # Install Rust and add Cargo's bin directory to the $PATH environment variable
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
-  --default-toolchain 1.76
+  --default-toolchain 1.81
 ENV PATH /home/comm/.cargo/bin:$PATH
 
 #-------------------------------------------------------------------------------

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.76"
+channel = "1.81"
 profile = "default"

services/backup/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.76-bullseye as builder
+FROM rust:1.81-bullseye as builder
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   build-essential cmake git libgtest-dev libssl-dev zlib1g-dev \

services/blob/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.76-bullseye as builder
+FROM rust:1.81-bullseye as builder
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   build-essential cmake git libgtest-dev libssl-dev zlib1g-dev \

services/commtest/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.76-bullseye
+FROM rust:1.81-bullseye
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   build-essential cmake git libgtest-dev libssl-dev zlib1g-dev \

services/feature-flags/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.76-bullseye as builder
+FROM rust:1.81-bullseye as builder
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   build-essential cmake git libgtest-dev libssl-dev zlib1g-dev \

services/identity/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.76-bullseye as builder
+FROM rust:1.81-bullseye as builder
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   build-essential cmake git libgtest-dev libssl-dev zlib1g-dev \

services/reports/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.76-bullseye as builder
+FROM rust:1.81-bullseye as builder
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   build-essential cmake git libgtest-dev libssl-dev zlib1g-dev \

services/tunnelbroker/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.76-bullseye as builder
+FROM rust:1.81-bullseye as builder
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   build-essential cmake git libgtest-dev libssl-dev zlib1g-dev \