NEWS entry.

Author: gpshead

Misc/NEWS.d/next/Core and Builtins/2023-12-13-11-45-53.gh-issue-106905.5dslTN.rst

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+Use per AST-parser state rather than global state to track recursion depth
+within the AST parser to prevent potential race condition due to
+simultaneous parsing.
+
+The issue primarily showed up in 3.11 by multithreaded users of
+:func:`ast.parse`.  In 3.12 a change to when garbage collection can be
+triggered prevented the race condition from occurring.