TestDigestsSingleSourceFile fails in clean codespace

Steps to reproduce on d9d591146932088ddf8fa1628efa034942072084:

1. Create a [new codespace](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=488968597).
2. Run `npm install -g @bazel/bazelisk`
3. Run `bazel test //...`

Note that `TestDigestsSingleSourceFile` fails:

```
$ bazel test //...
INFO: Analyzed 36 targets (0 packages loaded, 0 targets configured).
INFO: Found 28 targets and 8 test targets...
FAIL: //pkg:pkg_test (see /home/codespace/.cache/bazel/_bazel_codespace/982569728e62b3340e5f2051314017bd/execroot/__main__/bazel-out/k8-fastbuild/testlogs/pkg/pkg_test/test.log)
INFO: From Testing //pkg:pkg_test:
==================== Test output for //pkg:pkg_test:
--- FAIL: TestDigestsSingleSourceFile (0.00s)
hash_cache_test.go:117: Wrong hash: want 33e4ab761182518bbdaabdb916ecea5ad264778881dbe4ce93567f07ea89784b got 00da44523270e18ac5d8529b6f477cadd88dbd6326d6ea9fb7eeb7fc02faac97
FAIL
================================================================================
INFO: Elapsed time: 0.569s, Critical Path: 0.07s
INFO: 2 processes: 1 internal, 1 linux-sandbox.
INFO: Build completed, 1 test FAILED, 2 total actions
```

Start by reproducing the failure in a clean codespace with the pinned commit, installing @bazel/bazelisk and running `bazel test //...`. Inspect `hash_cache_test.go` around `TestDigestsSingleSourceFile` and its test output; done means the test passes with the expected digest in a clean environment.

Written by the indexing model from the issue text.