west: Update picolibc to version 1.8.5

Picolibc version 1.8.5 offers additional memory savings and new long-long
and minimal printf variants which can be selected from either the SDK or
module version of the library.

This needed a patch to the Zephyr cmake support bits to enable one of the
new picolibc 1.8.5 features.

Signed-off-by: Keith Packard <keithp@keithp.com>