chore: setup.py cleanup

[P403n1x87]

We do a minor setup.py cleanup, focusing on typing correctness.

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:

setup.py                                                                @DataDog/python-guild

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 283 ± 3 ms.

The average import time from base is: 286 ± 5 ms.

The import time difference between this PR and base is: -3.6 ± 0.2 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.098 ms (0.74%)

ddtrace.bootstrap.sitecustomize 1.416 ms (0.50%)

ddtrace.bootstrap.preload 1.416 ms (0.50%)

ddtrace.internal.remoteconfig.client 0.655 ms (0.23%)

ddtrace 0.682 ms (0.24%)

ddtrace.internal._unpatched 0.034 ms (0.01%)

json 0.034 ms (0.01%)

json.decoder 0.034 ms (0.01%)

re 0.034 ms (0.01%)

enum 0.034 ms (0.01%)

types 0.034 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-18 11:42:51

Comparing candidate commit a94e0c5 in PR branch chore/setup-cleanup with baseline commit ff35f5b in branch main.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 560 metrics, 3 unstable metrics.

scenario:iastaspects-format_map_aspect

• 🟥 execution_time [+334.265ns; +434.034ns] or [+10.321%; +13.402%]