deps: bump Rust toolchain to 1.75.0

This commit prepares upgrading the version of Zenoh to 1.0.4 by bumping
the version of the Rust toolchain to 1.75.0.

As with every new version of Rust, new Clippy warnings are introduced.
This commit also fixes them.

* rust-toolchain.toml: bump the toolchain to 1.75.0.
* zenoh-flow-descriptors/src/flattened/mod.rs: removed the unused
  exports.
* zenoh-flow-nodes/src/io/outputs.rs: use `or_default`.
* zenoh-flow-records/src/dataflow.rs: use `or_default`.

Signed-off-by: Julien Loudet <julien.loudet@zettascale.tech>

rust-toolchain.toml

@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.72.1"
+channel = "1.75.0"

zenoh-flow-descriptors/src/flattened/mod.rs

@@ -25,13 +25,6 @@ use std::{
 
 use zenoh_flow_commons::NodeId;
 
-pub use self::{
-    dataflow::FlattenedDataFlowDescriptor,
-    nodes::{
-        operator::FlattenedOperatorDescriptor, sink::FlattenedSinkDescriptor,
-        source::FlattenedSourceDescriptor,
-    },
-};
 use crate::{
     nodes::operator::composite::{CompositeInputDescriptor, CompositeOutputDescriptor},
     InputDescriptor, LinkDescriptor, OutputDescriptor,

zenoh-flow-nodes/src/io/outputs.rs

@@ -56,7 +56,7 @@ impl Outputs {
     /// Insert the `flume::Sender` in the [Outputs], creating the entry if needed in the internal
     /// `HashMap`.
     pub fn insert(&mut self, port_id: PortId, tx: Sender<LinkMessage>) {
-        self.hmap.entry(port_id).or_insert_with(Vec::new).push(tx)
+        self.hmap.entry(port_id).or_default().push(tx)
     }
 
     /// Returns an Output builder for the provided `port_id`, if an output was declared with this exact name in the

zenoh-flow-records/src/dataflow.rs

@@ -208,7 +208,7 @@ Caused by:
                 );
                 additional_mappings
                     .entry(runtime_from.clone())
-                    .or_insert_with(HashSet::default)
+                    .or_default()
                     .insert(sender_id);
 
                 receivers.insert(
@@ -220,7 +220,7 @@ Caused by:
                 );
                 additional_mappings
                     .entry(runtime_to.clone())
-                    .or_insert_with(HashSet::default)
+                    .or_default()
                     .insert(receiver_id);
             }
         }