chore: fix cargo clippy issues with new versions of rust

[brettlangdon]

With #13902 we are getting a newer version of rust and cargo clippy is reporting this error:

error: variables can be used directly in the `format!` string
  --> library_config.rs:56:31
   |
56 |                 let err_msg = format!("Failed to get configuration: {:?}", e);
   |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
   = note: `-D clippy::uninlined-format-args` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::uninlined_format_args)]`
help: change this to
   |
56 -                 let err_msg = format!("Failed to get configuration: {:?}", e);
56 +                 let err_msg = format!("Failed to get configuration: {e:?}");
   |
error: variables can be used directly in the `format!` string
   --> library_config.rs:119:27
    |
119 |             let err_msg = format!("Failed to store the tracer configuration: {:?}", e);
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
help: change this to
    |
119 -             let err_msg = format!("Failed to store the tracer configuration: {:?}", e);
119 +             let err_msg = format!("Failed to store the tracer configuration: {e:?}");
    |
error: could not compile `ddtrace-native` (lib) due to 2 previous errors

This change fixes this.

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

src/native/library_config.rs                                            @DataDog/apm-core-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 279 ± 4 ms.

The average import time from base is: 280 ± 3 ms.

The import time difference between this PR and base is: -1.5 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 1.938 ms (0.70%)

ddtrace.bootstrap.sitecustomize 1.261 ms (0.45%)

ddtrace.bootstrap.preload 1.261 ms (0.45%)

ddtrace.internal.remoteconfig.client 0.649 ms (0.23%)

ddtrace 0.677 ms (0.24%)

ddtrace.internal._unpatched 0.030 ms (0.01%)

json 0.030 ms (0.01%)

json.decoder 0.030 ms (0.01%)

re 0.030 ms (0.01%)

enum 0.030 ms (0.01%)

types 0.030 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-07-09 14:19:01

Comparing candidate commit 1ed8e4f in PR branch brettlangdon/fix.clippy with baseline commit 573a530 in branch main.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 527 metrics, 2 unstable metrics.

scenario:iastaspects-replace_aspect

• 🟥 execution_time [+570.897ns; +695.172ns] or [+11.967%; +14.572%]