DOC: Use DiskCache to prevent #317

[basnijholt]

Prevents the issue in #317 and this docs build.

Related:

• multiprocessing Manager error: send() called for a closed connection python/cpython#71936 (comment)
• gh-71936: Fix race condition in multiprocessing.Pool python/cpython#98274 (comment)

[codspeed-hq]

CodSpeed Performance Report

Merging #318 will not alter performance

_{Comparing disk-cache (30451a5) with main (30ea3d4)}

Summary

✅ 3 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
pipefunc/_pipeline.py	100.00% <100.00%> (ø)