fix: use atomic counter in pet-pipenv test temp dirs to prevent paral… #1390

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 42s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 42s
Tests (macos-latest, x86_64-apple-darwin, yes)	16m 43s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	8m 12s
Tests (macos-14, aarch64-apple-darwin, yes)	11m 32s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 18s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 58s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 52s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 30s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 55s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 57s
Builds (windows-latest, aarch64-pc-windows-msvc)	5m 2s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 59s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 2s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	8m 24s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	9m 18s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	6m 37s
	1h 41m 43s

Provide feedback