ci: update Rust to 1.84.0

Author: link2xt

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
     name: Lint Rust
     runs-on: ubuntu-latest
     env:
-      RUSTUP_TOOLCHAIN: 1.83.0
+      RUSTUP_TOOLCHAIN: 1.84.0
     steps:
       - uses: actions/checkout@v4
         with:
@@ -97,11 +97,11 @@ jobs:
       matrix:
         include:
           - os: ubuntu-latest
-            rust: 1.83.0
+            rust: 1.84.0
           - os: windows-latest
-            rust: 1.83.0
+            rust: 1.84.0
           - os: macos-latest
-            rust: 1.83.0
+            rust: 1.84.0
 
           # Minimum Supported Rust Version = 1.77.0
           - os: ubuntu-latest

scripts/coredeps/install-rust.sh

@@ -7,7 +7,7 @@ set -euo pipefail
 #
 # Avoid using rustup here as it depends on reading /proc/self/exe and
 # has problems running under QEMU.
-RUST_VERSION=1.83.0
+RUST_VERSION=1.84.0
 
 ARCH="$(uname -m)"
 test -f "/lib/libc.musl-$ARCH.so.1" && LIBC=musl || LIBC=gnu

src/imap.rs

@@ -1589,10 +1589,8 @@ impl Session {
         };
 
         if self.can_metadata() && self.can_push() {
-            let device_token_changed = context
-                .get_config(Config::DeviceToken)
-                .await?
-                .map_or(true, |config_token| device_token != config_token);
+            let device_token_changed =
+                context.get_config(Config::DeviceToken).await?.as_ref() != Some(&device_token);
 
             if device_token_changed {
                 let folder = context