[3.13] gh-120524: Avoid a Race On _PyRuntime.types.managed_static.types[i].interp_count (gh-120529) #120657
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gh-120182 added new global state (interp_count), but didn't add thread-safety for it. This change eliminates the possible race.
(cherry picked from commit 2c66318)
Co-authored-by: Eric Snow [email protected]