remove _ZlibDecompressor

Author: StanFromIreland

Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst

@@ -1,5 +1,5 @@
 Fix a dangling input pointer in :class:`lzma.LZMADecompressor`,
-:class:`bz2.BZ2Decompressor`, and internal :class:`!zlib._ZlibDecompressor`
+and :class:`bz2.BZ2Decompressor`
 when memory allocation fails with :exc:`MemoryError`, which could let a
 subsequent :meth:`!decompress` call read or write through a stale pointer to
 the already-released caller buffer.