Update PY_SUPPORT_TIER for Windows ARM64

[chris-eibl]

aarch64-pc-windows-msvc is now Tier 2 (python/peps#5046) and the build bots have been adapted (python/buildmaster-config#772), but

cpython/PC/pyconfig.h

Lines 171 to 173 in b0c9fc3

	#elif defined(_M_ARM64)
	#define _Py_COMPILER _Py_PASTE_VERSION("64 bit (ARM64)")
	#define PY_SUPPORT_TIER 3

has not been updated, yet.

I'll create a PR if this seems worthwhile.

@zooba, @hugovk, @diegorusso

Linked PRs

• GH-156554: Set PY_SUPPORT_TIER=2 for Windows ARM64 builds #156576

[StanFromIreland]

I'll create a PR if this seems worthwhile.

I think that this is worthwhile. 👍