[meta] update to Rust 1.88 (#8506)

Author: sunshowers

clippy.toml

@@ -26,7 +26,7 @@ disallowed-methods = [
 ]
 disallowed-types = [
     { path = "once_cell::unsync::Lazy", reason = "use `std::cell::LazyCell` instead" },
-    { path = "once_cell::unsync::LazyCell", reason = "use `std::cell::LazyCell` instead" },
+    { path = "once_cell::sync::Lazy", reason = "use `std::sync::LazyLock` instead" },
 ]
 
 [[disallowed-macros]]

dev-tools/omdb/src/bin/omdb/nexus.rs

@@ -4055,7 +4055,7 @@ async fn cmd_nexus_support_bundles_delete(
 }
 
 async fn write_stream_to_sink(
-    mut stream: impl futures::Stream<Item = anyhow::Result<bytes::Bytes>>,
+    stream: impl futures::Stream<Item = anyhow::Result<bytes::Bytes>>,
     mut sink: impl std::io::Write,
 ) -> Result<(), anyhow::Error> {
     let mut stream = std::pin::pin!(stream);

internal-dns/types/src/config.rs

@@ -593,8 +593,8 @@ impl DnsConfigBuilder {
             .get(&ServiceName::BoundaryNtp)
             .map(|zone2port| {
                 let records = zone2port
-                    .iter()
-                    .map(|(zone, _port)| {
+                    .keys()
+                    .map(|zone| {
                         let zone_ip = self.zones.get(&zone).expect(
                             "service_backend_zone() ensures zones are defined",
                         );

rust-toolchain.toml

@@ -2,5 +2,5 @@
 # We choose a specific toolchain (rather than "stable") for repeatability.  The
 # intent is to keep this up-to-date with recently-released stable Rust.
 
-channel = "1.87.0"
+channel = "1.88.0"
 profile = "default"