gh-134070: Add news entry for mimalloc out-of-bounds fix

Author: vedant713

Misc/NEWS.d/next/Core_and_Builtins/2025-05-17-16-45-00.gh-issue-134070.vdhoke.rst

@@ -1,4 +1,4 @@
 .. gh-issue: 134070
 .. section: Core and Builtins
 
-Fixed an out-of-bounds read in the generic implementation of `mi_clz32` and `mi_ctz32` in the integrated mimalloc allocator. This bug could occur on platforms with 64-bit `unsigned long` values. Based on upstream fix from microsoft/mimalloc.
+Fixed an out-of-bounds read in the generic implementation of ``mi_clz32`` and ``mi_ctz32`` in the integrated mimalloc allocator. This bug could occur on platforms with 64-bit `unsigned long` values. Based on upstream fix from microsoft/mimalloc.