Update Rust to v1.74.0 (#7543)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

backend.Dockerfile

@@ -1,5 +1,5 @@
 # renovate: datasource=github-tags depName=rust lookupName=rust-lang/rust
-ARG RUST_VERSION=1.73.0@sha256:73af736ea21c14181c257bf674c7095a8bad6343a1eadd327a8bf1ce1c5209b4
+ARG RUST_VERSION=1.74.0
 
 FROM rust:$RUST_VERSION
 

rust-toolchain.toml

@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.73.0"
+channel = "1.74.0"

src/bin/background-worker.rs

@@ -79,7 +79,7 @@ fn main() -> anyhow::Result<()> {
     let connection_pool = r2d2::Pool::builder()
         .max_size(10)
         .min_idle(Some(0))
-        .build_unchecked(ConnectionManager::new(&db_url));
+        .build_unchecked(ConnectionManager::new(db_url));
 
     let connection_pool = DieselPool::new_background_worker(connection_pool);