Bump toolchains/riscv-tools/riscv-openocd from e870c5f to 8f59570

Bumps [toolchains/riscv-tools/riscv-openocd](https://github.com/riscv/riscv-openocd) from `e870c5f` to `8f59570`.
- [Release notes](https://github.com/riscv/riscv-openocd/releases)
- [Commits](riscv-collab/riscv-openocd@e870c5f...8f59570)

---
updated-dependencies:
- dependency-name: toolchains/riscv-tools/riscv-openocd
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>