gh-112075: Enable freeing with qsbr and fallback to lock on key changed #116336
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Couple of small tweaks for dict thread safety:
DKIX_KEY_CHANGEDwhen storing instance attributes. This was introduced with gh-112075: Avoid locking shared keys on every assignment #116087 and got exposed when combining it with GH-115776: Embed the values array into the object, for "normal" Python objects. #116115dictobjects thread-safe in--disable-gilbuilds #112075