Release of version 5.8.1.

Nix

[pre-commit.ci] pre-commit autoupdate

CMake: fix use of jrl-cmakemodules

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.5.1 → v0.5.5](https://github.com/astral-sh/ruff-pre-commit/compare/v0.5.1...v0.5.5)

[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.4.8 → v0.5.1](https://github.com/astral-sh/ruff-pre-commit/compare/v0.4.8...v0.5.1)
- [github.com/pre-commit/mirrors-clang-format: v18.1.6 → v18.1.8](https://github.com/pre-commit/mirrors-clang-format/compare/v18.1.6...v18.1.8)

[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.3.4 → v0.4.8](https://github.com/astral-sh/ruff-pre-commit/compare/v0.3.4...v0.4.8)
- [github.com/pre-commit/mirrors-clang-format: v18.1.2 → v18.1.6](https://github.com/pre-commit/mirrors-clang-format/compare/v18.1.2...v18.1.6)
- [github.com/pre-commit/pre-commit-hooks: v4.5.0 → v4.6.0](https://github.com/pre-commit/pre-commit-hooks/compare/v4.5.0...v4.6.0)

CMake: fix jrl-cmake-module use

when it is used from the system or fetched, it is not at
${CMAKE_SOURCE_DIR}/cmake

[pre-commit.ci] pre-commit autoupdate

for more information, see https://pre-commit.ci