submodule(ready-to-run): bump nemu and spike ref in ready-to-run (#4012)

Bump nemu and spike ref in ready-to-run
* NEMU commit: 4ecc99ec95eb3d72bae79b70d80b0df16c0e3b2f
* NEMU configs:
    * riscv64-xs-ref_defconfig
    * riscv64-dual-xs-ref_defconfig

Including:
    * fix(store_event): Undefined Behavior that shift
    * fix(store_event): differences in display mask
    * feat: improve the display of registers
 
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* spike commit: 6888be99fd544c5450fbb4fcae35b030d98fbcee
* spike config: CPU=XIANGSHAN

Including:
    * feat(Zicclsm): add misalign store check for CPU=XIANGSHAN