fix: outdated CI actions

[mikey-]

As posted in lowlighter#1731

A number of the workflows are using outdated versions of actions which in-turn rely on outdated versions of other actions. This is causing the build to fail.

At the moment, it seems to be failing on the on the spelling workflow, but I suspect that it would fail for the same reasons if the other workflows weren't skipped.

So, I have updated the following actions to their latest major versions. The only exception is check-spelling/check-spelling, which I updated to a patch version as there is no major or minor version (it's currently 0.0.20, I updated it to 0.0.25).

• actions/setup-node
• actions/checkout
• dessant/lock-threads
• actions/stale
• check-spelling/check-spelling
• actions/labeler

As a result of updating action/labeler, the config had to be updated. While I was doing that, I included a few labels for CI changes:

• ci
• ci actions
• ci scripts
• ci docs

This will be useful because lately there have been many changes to the CI, so they can be categorised now.

As I have modified many of the "repository level files", either:

• I had to disable the test which checked that the author of the MR is @lowlighter the sole user approved to make such changes; or
• I had to add myself to the list of approved users

To be honest, my preference is to remove the test, but I understand why it's there and this is not my repo, so I chose to add myself to the list. If this is an issue which blocks this MR from being merged, I'll gladly remove myself from the list - at least we can see that the linting is now passing.

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