[issue42361] Use Tcl/Tk 8.6.10 in build-installer.py when building on recent macOS

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +22919
pull_request: https://github.com/python/cpython/pull/24086

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42361>
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