Sync tests

[depial]

This updates the tests of anagram and all-your-base as per Issue #948

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

For more information, refer to the documentation. If you are unsure whether to add the message or not, please ping @exercism/maintainers-admin in a comment. Thank you!

[depial]

We should include [no important files changed] in the commit message.

[colinleach]

I've approved, but recommend not merging yet. There are all sorts of problems with the website today (at the AWS server level). More details on the maintaining channel of Discord. Jeremy is partly aware, but more trouble has surfaced while he's been asleep in Japan.

Bottom line for us: merges on GH don't sync to Exercism. Also, the online editor is misbehaving.

[colinleach]

I'll try merging this to see what happens.

Update: it worked.