Update for Rust v1.62.0

Remove unused Lifetime
See https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes

Test: Ran test_compiler.py
Bug: 236723597
Change-Id: I93557904e35930e6ea308bfab4cdefdf0932b45a
diff --git a/authfs/src/fusefs.rs b/authfs/src/fusefs.rs
index beb6b30..cfb53ca 100644
--- a/authfs/src/fusefs.rs
+++ b/authfs/src/fusefs.rs
@@ -149,7 +149,7 @@
     prev_offset: usize,
 }
 
-impl<'a> DirectoryIterator for DirEntriesSnapshotIterator {
+impl DirectoryIterator for DirEntriesSnapshotIterator {
     fn next(&mut self) -> Option<DirEntry> {
         // This iterator should not be the only reference to the snapshot. The snapshot should
         // still be hold in `dir_handle_table`, i.e. when the FD is not yet closed.