Labelling bot seems unable to identify Windows issues

We should look at the labeller bot and ensure that it can correctly identify issues relating to Windows and tag them with `os:windows`. I've just added that label to a few issues manually.

Noting that the following is not the same list:
- [Search for `Windows`](https://github.com/adoptium/infrastructure/issues?q=is%3Aissue%20state%3Aopen%20windows)
- [`os:windows` label](https://github.com/adoptium/infrastructure/issues?q=is%3Aissue%20state%3Aopen%20windows%20label%3Aos%3Awindows)

Also noting that the above list includes quite a lot more as some things (such as [the new machine template](https://github.com/adoptium/infrastructure/blob/master/.github/ISSUE_TEMPLATE/newmachine.md)) includes `windows` in the example list of operating systems so it perhaps needs be looking for `windows` without `/` around it. This is probably true of some of the others os/arch labelling too so a general review might be in order.

Start by locating the labeller bot and comparing its matching behavior with the open-issue search and the `os:windows` label results. Review `.github/ISSUE_TEMPLATE/newmachine.md` as a known source of false or missed matches, then verify that relevant Windows issues receive `os:windows` without incorrectly tagging unrelated issues.

Written by the indexing model from the issue text.