Release riscv-isa-release-19338c6-2025-01-09

This release was created by: aswaterman
Release of RISC-V ISA, built from commit 19338c6, is now available.

What's Changed

• Clarify misa.M behaviour with Zmmul by @Timmmm in #1793

Full Changelog: riscv-isa-release-2d67e85-2025-01-09...riscv-isa-release-19338c6-2025-01-09