ci: fix subprocess wrapper [backport 1.18]

[github-actions]

Backport 8863df6 from #6624 to 1.18.

This change fixes the pytest.mark.subprocess decorator

Checklist

• Change(s) are motivated and described in the PR description.
• Testing strategy is described if automated tests are not included in the PR.
• Risk is outlined (performance impact, potential for breakage, maintainability, etc).
• Change is maintainable (easy to change, telemetry, documentation).
• Library release note guidelines are followed. If no release note is required, add label changelog/no-changelog.
• Documentation is included (in-code, generated user docs, public corp docs).
• Backport labels are set (if applicable)

Reviewer Checklist

• Title is accurate.
• No unnecessary changes are introduced.
• Description motivates each change.
• Avoids breaking API changes unless absolutely necessary.
• Testing strategy adequately addresses listed risk(s).
• Change is maintainable (easy to change, telemetry, documentation).
• Release note makes sense to a user of the library.
• Reviewer has explicitly 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

[pr-commenter]

Benchmarks

Benchmark execution time: 2023-08-11 22:18:19

Comparing candidate commit 1a571b7 in PR branch backport-6624-to-1.18 with baseline commit cc8d9dc in branch 1.18.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 94 metrics, 0 unstable metrics.