Address beta clippy lint needless_lifetimes (#9877)

The 1.82.0 version of Rust will be stable soon, let's get the clippy
lint fixes in before the compiler version upgrade.

Author: arpad-m

libs/vm_monitor/src/cgroup.rs

@@ -218,7 +218,7 @@ impl MemoryStatus {
     fn debug_slice(slice: &[Self]) -> impl '_ + Debug {
         struct DS<'a>(&'a [MemoryStatus]);
 
-        impl<'a> Debug for DS<'a> {
+        impl Debug for DS<'_> {
             fn fmt(&self, f: &mut Formatter) -> fmt::Result {
                 f.debug_struct("[MemoryStatus]")
                     .field(
@@ -233,7 +233,7 @@ impl MemoryStatus {
 
         struct Fields<'a, F>(&'a [MemoryStatus], F);
 
-        impl<'a, F: Fn(&MemoryStatus) -> T, T: Debug> Debug for Fields<'a, F> {
+        impl<F: Fn(&MemoryStatus) -> T, T: Debug> Debug for Fields<'_, F> {
             fn fmt(&self, f: &mut Formatter) -> fmt::Result {
                 f.debug_list().entries(self.0.iter().map(&self.1)).finish()
             }

pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/slice.rs

@@ -19,21 +19,21 @@ impl<'a, const N: usize, const A: usize> AlignedSlice<'a, N, ConstAlign<A>> {
     }
 }
 
-impl<'a, const N: usize, A: Alignment> Deref for AlignedSlice<'a, N, A> {
+impl<const N: usize, A: Alignment> Deref for AlignedSlice<'_, N, A> {
     type Target = [u8; N];
 
     fn deref(&self) -> &Self::Target {
         self.buf
     }
 }
 
-impl<'a, const N: usize, A: Alignment> DerefMut for AlignedSlice<'a, N, A> {
+impl<const N: usize, A: Alignment> DerefMut for AlignedSlice<'_, N, A> {
     fn deref_mut(&mut self) -> &mut Self::Target {
         self.buf
     }
 }
 
-impl<'a, const N: usize, A: Alignment> AsRef<[u8; N]> for AlignedSlice<'a, N, A> {
+impl<const N: usize, A: Alignment> AsRef<[u8; N]> for AlignedSlice<'_, N, A> {
     fn as_ref(&self) -> &[u8; N] {
         self.buf
     }