dc11e3b3bc made scripts/releases/versioning.py import the new sibling
scripts/releases/semver.py. Three fixtures hand-copy a file list of that
package into a temp tree, so importing versioning there now dies with
`ModuleNotFoundError: No module named 'scripts.releases.semver'`
(JS & TS checks: channel-build-version.test.ts MSIX manifest case; the
same import chain runs in test_source_build_env.py and
test_commit_stamp_identity.py via distance -> versioning).
Copy the package as a tree, like the fixtures already do for pm/, so the
next intra-package import cannot silently break them again.
f0ae9e0568