Apply suggestions from clippy 1.83

Author: djc

src/layer.rs

@@ -160,7 +160,7 @@ struct SpanEventVisitor<'a, 'b> {
     sem_conv_config: SemConvConfig,
 }
 
-impl<'a, 'b> field::Visit for SpanEventVisitor<'a, 'b> {
+impl field::Visit for SpanEventVisitor<'_, '_> {
     /// Record events on the underlying OpenTelemetry [`Span`] from `bool` values.
     ///
     /// [`Span`]: opentelemetry::trace::Span
@@ -403,7 +403,7 @@ struct SpanAttributeVisitor<'a> {
     sem_conv_config: SemConvConfig,
 }
 
-impl<'a> SpanAttributeVisitor<'a> {
+impl SpanAttributeVisitor<'_> {
     fn record(&mut self, attribute: KeyValue) {
         self.span_builder_updates
             .attributes
@@ -412,7 +412,7 @@ impl<'a> SpanAttributeVisitor<'a> {
     }
 }
 
-impl<'a> field::Visit for SpanAttributeVisitor<'a> {
+impl field::Visit for SpanAttributeVisitor<'_> {
     /// Set attributes on the underlying OpenTelemetry [`Span`] from `bool` values.
     ///
     /// [`Span`]: opentelemetry::trace::Span

src/metrics.rs

@@ -178,7 +178,7 @@ pub(crate) struct MetricVisitor<'a> {
     visited_metrics: &'a mut SmallVec<[(&'static str, InstrumentType); 2]>,
 }
 
-impl<'a> Visit for MetricVisitor<'a> {
+impl Visit for MetricVisitor<'_> {
     fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
         self.attributes
             .push(KeyValue::new(field.name(), format!("{value:?}")));