* pin opencv version

Co-authored-by: Sugar-Baby <87747602+Sugar-Baby@users.noreply.github.com>
Co-authored-by: AtomAlpaca <66774326+AtomAlpaca@users.noreply.github.com>

* helper function for selecting the optimal coopmat mnk size

* fix crash on nt kernel without GetLogicalProcessorInformationEx

* fix 1d 2d cstep

* fix ranged cstep

* Add lasx optimization for loongarch_usability.h

* Add _LOONGARCH_FLOAT_CONST_PS256 to avoid variable redefinition

* Add lasx optimization for math funtion

* Add lasx optimization for sigmoid

* add lsx optimization for trigonometric functions

* add lasx optimization for trigonometric functions

- synchronize the latest English content to the Chinese documentation
- correct spelling errors in the English version of glsl-extention
- Fix spelling 'enable_validation_layer' in src/gpu.cpp

Bumps [stefanzweifel/git-auto-commit-action](https://github.com/stefanzweifel/git-auto-commit-action) from 5 to 6.
- [Release notes](https://github.com/stefanzweifel/git-auto-commit-action/releases)
- [Changelog](https://github.com/stefanzweifel/git-auto-commit-action/blob/master/CHANGELOG.md)
- [Commits](https://github.com/stefanzweifel/git-auto-commit-action/compare/v5...v6)

---
updated-dependencies:
- dependency-name: stefanzweifel/git-auto-commit-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Use platform-specific APIs for environment variables

The previous patch used `putenv` as a quick fix for Windows compatibility. However, `putenv` is a legacy API and not the recommended choice.

This commit replaces the single `putenv` call with the most appropriate function for each platform:
- On Windows, it now uses the modern and secure `_putenv_s`.
- On Unix-like systems, it uses the standard `setenv`.

---------

Co-authored-by: nihui <shuizhuyuanluo@126.com>

* add int8 definitions
* packing vulkan int8/int32, quantize vulkan
* vulkan dequantize
* requantize vulkan

* fix pyncnn build

* always prefer xtheadvector
* update ci toolchain