Fix build warnings treated as errors

[jaseemabid]

These warnings prevent builds on latest master with latest stable rustc 1.78.0 (9b00956e5 2024-04-29)

Full error:

   Compiling sonic-server v1.4.8 (/Users/j/src/sonic)
error: unnecessary qualification
   --> src/store/fst.rs:690:36
    |
690 | ...                   if std::fs::rename(&bucket_tmp_path, &bucket_final_path).is_ok() {
    |                          ^^^^^^^^^^^^^^^
    |
note: the lint level is defined here
   --> src/main.rs:8:44
    |
8   | #![deny(unstable_features, unused_imports, unused_qualifications, clippy::all)]
    |                                            ^^^^^^^^^^^^^^^^^^^^^
help: remove the unnecessary path segments
    |
690 -                                 if std::fs::rename(&bucket_tmp_path, &bucket_final_path).is_ok() {
690 +                                 if fs::rename(&bucket_tmp_path, &bucket_final_path).is_ok() {
    |

warning: trait `StoreGenericKey` is never used
  --> src/store/generic.rs:14:11
   |
14 | pub trait StoreGenericKey {}
   |           ^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: `sonic-server` (bin "sonic") generated 1 warning
error: could not compile `sonic-server` (bin "sonic") due to 1 previous error; 1 warning emitted

[chenrui333]

@valeriansaliou any chance to cut a new release for this PR patch, seeing the failed build upgrading rust to 1.79.0 on the homebrew side. Thanks!

[valeriansaliou]

@chenrui333 sure! Added to my TODO for today.

[valeriansaliou]

@chenrui333 I just released v1.4.9

[chenrui333]

Thanks @valeriansaliou!