chore(deps): remove number-prefix in favor of unit_prefix

[thomasqueirozb]

Summary

number-prefix crate is unmaintained. This was causing the cargo deny workflow to fail

611 │ number_prefix 0.4.0 registry+https://github.com/rust-lang/crates.io-index
    │ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ unmaintained advisory detected
    │
    ├ ID: RUSTSEC-2025-0119
    ├ Advisory: https://rustsec.org/advisories/RUSTSEC-2025-0119
    ├ The `number_prefix` crate is no longer actively maintained.  If you rely on this crate, consider switching to a recommended alternative.
      
      ## Recommended alternatives
      
      - [`unit-prefix`](https://crates.io/crates/unit-prefix)

Vector configuration

NA

How did you test this PR?

ran cargo top

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

• Related: https://github.com/vectordotdev/vector/actions/runs/19560588016/attempts/1

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