picolibc: Update to version proposed for Zephyr main

Fast forward to upstream version containing a fix for a C++
incompatibility where isinf and isnan were incorrectly declared as C
functions.

This version also contains another useful change to disable the
picolibc malloc implementation when built as a Zephyr module. This
should improve error messages with Zephyr projects which use malloc
but fail to define CONFIG_COMMON_LIBC_MALLOC.

There are also minor cleanups in a few math functions in how
FE_INEXACT exceptions are generated and AArch32 A-profile aeabi memcpy
functions.

Zephyr PR for this same version:

	zephyrproject-rtos/zephyr#93529

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard