build: bump MSRV to 1.76.0 (#5586)

crates/router_env/src/lib.rs

@@ -1,4 +1,3 @@
-#![forbid(unsafe_code)]
 #![warn(missing_debug_implementations)]
 
 //!

crates/router_env/src/logger/config.rs

@@ -151,6 +151,8 @@ impl Config {
             .add_source(config::Environment::with_prefix("ROUTER").separator("__"))
             .build()?;
 
+        // The logger may not yet be initialized when constructing the application configuration
+        #[allow(clippy::print_stderr)]
         serde_path_to_error::deserialize(config).map_err(|error| {
             crate::error!(%error, "Unable to deserialize configuration");
             eprintln!("Unable to deserialize application configuration: {error}");

crates/router_env/src/logger/setup.rs

@@ -33,6 +33,7 @@ pub struct TelemetryGuard {
 /// Setup logging sub-system specifying the logging configuration, service (binary) name, and a
 /// list of external crates for which a more verbose logging must be enabled. All crates within the
 /// current cargo workspace are automatically considered for verbose logging.
+#[allow(clippy::print_stdout)] // The logger hasn't been initialized yet
 pub fn setup(
     config: &config::Log,
     service_name: &str,
@@ -271,6 +272,7 @@ fn setup_tracing_pipeline(
         .install_batch(runtime::TokioCurrentThread)
         .map(|tracer| tracing_opentelemetry::layer().with_tracer(tracer));
 
+    #[allow(clippy::print_stderr)] // The logger hasn't been initialized yet
     if config.ignore_errors {
         traces_layer_result
             .map_err(|error| {
@@ -315,6 +317,7 @@ fn setup_metrics_pipeline(config: &config::LogTelemetry) -> Option<BasicControll
         )]))
         .build();
 
+    #[allow(clippy::print_stderr)] // The logger hasn't been initialized yet
     if config.ignore_errors {
         metrics_controller_result
             .map_err(|error| eprintln!("Failed to setup metrics pipeline: {error:?}"))