Removes needless borrows

[brooksprumo]

Problem

While working on #31487 to upgrade our nightly Rust version, we ran into clippy lint errors like this one:

error: the borrowed expression implements the required traits
  | --> core/src/serve_repair.rs:1452:47
  | \|
  | 1452 \|         let mut pkt = Packet::from_data(None, &request).unwrap();
  | \|                                               ^^^^^^^^ help: change this to: `request`
  | \|
  | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
  | = note: `-D clippy::needless-borrow` implied by `-D warnings`

Here's the build log: https://buildkite.com/solana-labs/solana/builds/95022#0187e79f-b4ed-4e24-b5d1-926696b8d1a3

Looks like there are a few needless borrows in serve_repair.rs that can be removed.

Summary of Changes

Remove needless borrows.

[jbiseda]

LGTM

[codecov]

Codecov Report

Merging #31489 (515362c) into master (22d4c6a) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           master   #31489   +/-   ##
=======================================
  Coverage    81.4%    81.4%           
=======================================
  Files         731      731           
  Lines      208782   208782           
=======================================
+ Hits       170043   170047    +4     
+ Misses      38739    38735    -4