How to manually bump cmd‐help version in bat's submodules

In the bat project, they use a sample test messsage to test cmd-help for regression.

We also track that sample (bat-short-0.22.1) in this project: source, highlighted.

If the highlighted version changes while running tests (and we merge the changes into main), we have to propagate that test change to bat.

That's because, normally, cmd-help.sublime-syntax is automatically updated by bat's Dependabot setup. (example)

But when the regression test message changes, we break the tests there, Dependabot flags our change, and the update won't proceed. (example)

So we have to update the highlighting of that message in bat and make a PR. (example)

Detailed steps

Update the submodule to latest:

git submodule update --remote assets/syntaxes/02_Extra/cmd-help

Build and install a bat binary with modified syntaxes and themes:

bash assets/create.sh
cargo install --path . --locked --force

Run syntax highlighting regression tests to update our test:
```
tests/syntax_tests/update.sh
```
Git add only the updated highlighted test file for cmd-help, nothing else
Update the Changelog in their style (see PR example above)
Commit everything together
Make the PR

Consider if you want to downgrade bat from this unreleased version to the previous one you had installed.

In any case, run this to recover the custom bat syntaxes & themes for your bat installation:

bat cache --build