chore: fix new clippy lints from 1.67.0 (tokio-rs#2451)

There are new warnings as errors reported by clippy in Rust 1.67.0.

This are causing builds to fail, e.g.:
https://github.com/tokio-rs/tracing/actions/runs/4027112923/jobs/6922513360

In both cases they are reports of lifetimes that can be elided. This
change removes the unnecessary lifetime annotations to make clippy
happy.

tracing-opentelemetry/src/layer.rs

@@ -83,9 +83,9 @@ pub(crate) struct WithContext(
 impl WithContext {
     // This function allows a function to be called in the context of the
     // "remembered" subscriber.
-    pub(crate) fn with_context<'a>(
+    pub(crate) fn with_context(
         &self,
-        dispatch: &'a tracing::Dispatch,
+        dispatch: &tracing::Dispatch,
         id: &span::Id,
         mut f: impl FnMut(&mut OtelData, &dyn PreSampledTracer),
     ) {