Bump nemu ref in ready-to-run

NEMU commit: 28034f5d3afdd10f39f71e0d5deaba32a76f71b8
NEMU configs:
- riscv64-xs-ref_defconfig
- riscv64-dual-xs-ref_defconfig
- riscv64-xs-ref-debug_defconfig
- riscv64-dual-xs-ref-debug_defconfig
Including :
- fix(vfredusum): Additive identity should be +0.0 when rounding down (towards -∞) (#975)
- chore(ready-to-run): download ready-to-run bins from release (#973)
- fix(monitor): missing newline character in the help information (#971)
- fix(paddr): Show detailed info when check_paddr failed (#867)
- fix(csr): use macro definitions instead of constants
- fix(csr): fix get mip.seip without AIA config

XiangShan ready-to-run binaries

This repo includes some prebuilt workloads and difftest reference libaries. Please refer to XiangShan-doc to learn how to use them.

This repo may be abandoned in feature, as we are trying to provide prebuilt binaries through Github release.

Prebuilt difftest reference libaries

riscv64-nemu-interpreter-so
- NEMU difftest reference library
- Built via the ci of OpenXiangShan/NEMU.
riscv64-nemu-interpreter-dual-so
- NEMU difftest reference library with dual core difftest support.
riscv64-spike-so
- SPIKE difftest reference library
- Built via the ci of OpenXiangShan/riscv-isa-sim.

linux.bin
- Simple Linux boot-up test.
- OpenSBI v1.4 + Linux 6.1.83 + print Hello
- ~~Built accodring to XiangShan-doc~~
  - The document has not updated for OpenSBI yet.
microbench.bin
- Baremental test-scale microbench workload
- Built via the ci of OpenXiangShan/nexus-am, application is apps/microbench
coremark-2-iteration.bin
- Baremental 2-iteration Coremark workload
- Built via the ci of OpenXiangShan/nexus-am, application is apps/coremark
copy_and_run.bin
- Copy 1-iteration coremark from flash to memory, and run it.
- Built via the ci of OpenXiangShan/nexus-am, application is apps/loader
flash_recursion_test.bin