fix: add missing windows arm64 in os_arch_names

[dennisameling]

In #3846 we added support for Windows arm64, but I forgot to add it to OS_ARCH_NAMES, so it's not actually working yet. This commit adds it.

Ref: 12d90ec

PR Checklist

It looks like the CI test suite isn't running on arm64 hosts at all (though e.g. windows-11-arm GitHub Actions runners are available nowadays), so I'm not sure whether the team wants to add that to the test matrix. Happy to add it.

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature (please, look at the "Scope of the project" section in the README.md file)
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Currently, when trying to use the windows_arm64 toolchain, this error is thrown:

Unsupported operating system windows architecture arm64

Issue Number: N/A

What is the new behavior?

Once this has been merged, people will be able to use the windows_arm64 toolchain.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[aspect-workflows]

Test

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