Bump toolchains/riscv-tools/riscv-pk from 1f5bcbe to 1a52fa4

Bumps [toolchains/riscv-tools/riscv-pk](https://github.com/riscv-software-src/riscv-pk) from `1f5bcbe` to `1a52fa4`.
- [Commits](riscv-software-src/riscv-pk@1f5bcbe...1a52fa4)

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

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