v3.14.4
[3.14] gh-144777: Fix data races in IncrementalNewlineDecoder (gh-144971) (#145143)
gh-132952: Speed up startup by importing _io instead of io (#132957)
gh-117151: IO performance improvement, increase io.DEFAULT_BUFFER_SIZE to 128k (GH-118144)
[3.14] gh-144380: Fix incorrect type check in `buffered_iternext()` (GH-144381) (#144389)
[3.14] gh-143378: Fix use-after-free when BytesIO is concurrently mutated during write operations (GH-143408) (GH-143599)
[3.14] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136119)
[3.14] gh-140607: Validate returned byte count in RawIOBase.read (GH-140611) (#140728)