chore(iroh-relay): Fix cargo check warning (#3346)

## Description

This should fix [the `minimal-crates`
failure](https://github.com/n0-computer/iroh/actions/runs/15528521924/job/43712497899)
that we run with the flaky test suite regularly.


![image](https://github.com/user-attachments/assets/a657d0b1-1332-439d-aa92-261a8026e6fb)

## Change checklist
<!-- Remove any that are not relevant. -->
- [X] Self-review.

Author: matheus23

iroh-relay/src/client/tls.rs

@@ -131,7 +131,7 @@ impl MaybeTlsStreamBuilder {
         }
     }
 
-    fn tls_servername(&self) -> Option<rustls::pki_types::ServerName> {
+    fn tls_servername(&self) -> Option<rustls::pki_types::ServerName<'_>> {
         let host_str = self.url.host_str()?;
         let servername = rustls::pki_types::ServerName::try_from(host_str).ok()?;
         Some(servername)

iroh/src/magicsock/node_map/best_addr.rs

@@ -180,7 +180,7 @@ impl BestAddr {
         self.0 = Some(inner);
     }
 
-    pub fn state(&self, now: Instant) -> State {
+    pub fn state(&self, now: Instant) -> State<'_> {
         match &self.0 {
             None => State::Empty,
             Some(state) => match state.trust_until {

iroh/src/watcher.rs

@@ -152,7 +152,7 @@ pub trait Watcher: Clone {
     /// # Cancel Safety
     ///
     /// The returned future is cancel-safe.
-    fn updated(&mut self) -> NextFut<Self> {
+    fn updated(&mut self) -> NextFut<'_, Self> {
         NextFut { watcher: self }
     }
 
@@ -166,7 +166,7 @@ pub trait Watcher: Clone {
     /// # Cancel Safety
     ///
     /// The returned future is cancel-safe.
-    fn initialized<T>(&mut self) -> InitializedFut<T, Self>
+    fn initialized<T>(&mut self) -> InitializedFut<'_, T, Self>
     where
         Self: Watcher<Value = Option<T>>,
     {