Upgrade Rust toolchain to 1.84.0 (#10533)

## Summary
Upgrade the rust toolchain to 1.84.0. This PR does not bump the MSRV.

crates/uv-resolver/src/lock/mod.rs

@@ -953,7 +953,7 @@ impl Lock {
                     .ok()
                     .flatten()
                     .map(|package| matches!(package.id.source, Source::Virtual(_)));
-                if actual.map_or(true, |actual| actual != expected) {
+                if actual != Some(expected) {
                     return Ok(SatisfiesResult::MismatchedSources(name.clone(), expected));
                 }
             }
@@ -973,7 +973,7 @@ impl Lock {
                     .ok()
                     .flatten()
                     .map(|package| &package.id.version);
-                if actual.map_or(true, |actual| actual != expected) {
+                if actual != Some(expected) {
                     return Ok(SatisfiesResult::MismatchedVersion(
                         name.clone(),
                         expected.clone(),

crates/uv-resolver/src/resolver/provider.rs

@@ -145,7 +145,7 @@ impl<'a, Context: BuildContext> DefaultResolverProvider<'a, Context> {
     }
 }
 
-impl<'a, Context: BuildContext> ResolverProvider for DefaultResolverProvider<'a, Context> {
+impl<Context: BuildContext> ResolverProvider for DefaultResolverProvider<'_, Context> {
     /// Make a "Simple API" request for the package and convert the result to a [`VersionMap`].
     async fn get_package_versions<'io>(
         &'io self,

crates/uv-resolver/src/yanks.rs

@@ -55,6 +55,6 @@ impl AllowedYanks {
     pub fn contains(&self, package_name: &PackageName, version: &Version) -> bool {
         self.0
             .get(package_name)
-            .map_or(false, |versions| versions.contains(version))
+            .is_some_and(|versions| versions.contains(version))
     }
 }