Update opencv requirement from 0.90.0 to 0.91.2

[dependabot]

Updates the requirements on opencv to permit the latest version.

Changelog

Sourced from opencv's changelog.

• 0.91.2

  • Generate functions for converting DirectX objects to OpenCL.
  • Allow creation of Vector<BoxedRef<T>> and using it as ToInputArray (fixes twistedfall/opencv-rust#555).

• 0.91.1

  • Add TryFrom<i32> impls for enums to allow easy fallible conversions from i32.

• 0.91.0

  • Multiple improvements for InputArray/OutputArray/InputOutputArray handling:
    • It's now possible to use the following types as InputArray: &[u8]/[u8; N], Vector<bool> Vector<GpuMat> and the following as InputArray, OutputArray or InputOutputArray: Vector<Mat> and Vector<UMat>.
    • InputArray/OutputArray/InputOutputArray constructors now return BoxedRef/BoxedRefMut to express the borrowing semantics.
    • Some constructors have received _mut suffix where appropriate.
  • Unsafe Mat constructors (*_with_data) have received _unsafe suffix and safe versions have been introduced that return BoxedRef/BoxedRefMut. Consequently, Mat::from_slice_rows_cols was replaced by Mat::new_rows_cols_with_data, note the different order and types of the arguments.
  • MatSize::new is now unsafe and accepts a pointer.

• 0.90.0

  • Automatically generate default constructors for classes where posssible.
  • Backwards-incompatible changes:
    • LayerParams::default() can no longer fail, so it returns Self without Result.
    • GpuMat::default() is now GpuMat::new_def().
    • Automatically named functions (*_1) in features2d module were given proper names.
    • Generate bindings to float16_t and hfloat types to fix the build with the current OpenCV master.

• 0.89.0

  • All functions accepting classes now take impl ClassTrait instead of Class directly. This allows passing other objects that implement the same trait. This change should be backwards compatible.
  • Some functions, notably Mat::roi(), now return a BoxedRef<Mat> wrapper instead of seemingly independent Mat. This fixes old soundness hole because the returned Mat was actually a view into the source Mat and you could easily end up with 2 mutable references to the same memory. An additional *_mut() is generated for each of such function to return a mutable BoxedRefMut<Mat>. To get 2 mutable references to the same Mat for the non-intersecting regions use the new Mat::roi_2_mut() function.
  • Slice detection improved, slice arguments in more functions are now generated automatically.
  • Some slices in function arguments are now references to arrays of particular size. To migrate call .try_into() to convert the slice to the array.
  • The error message for the unspecified error (should never actually be visible) is changed to "Unspecified error, neither from OpenCV nor from std".
  • Function signature changes:
    • A group of functions for Mat, UMat, GpuMat and GpuMatND have been given proper names (rowscols, roi, ranges, col_bounds). Consequently, e.g. roi function can now be called on the Mat instance (mat.roi()) instead of requiring a fully qualified call (Mat::roi(&mat)).
    • MatConstIterator::pos_to() is now unsafe and takes a pointer instead of a reference.

• 0.88.9

  • Fix building on macOS with vcpkg (fixes twistedfall/opencv-rust#549).

• 0.88.8

... (truncated)

Commits

• 6693895 chore: Release
• 87b2cdc chore: Release
• c6c5173 Update changelog
• 80123ec Allow creation of Vector<BoxedRef instances and using them as ToInputArray
• d718187 Drop VectorElement trait in favor of VectorToVec
• edc4431 Add DirectX function support
• 84f76c2 Cleanup
• b9565e7 Update docs
• 9cd4cef Cleanup
• 9462ea2 Merge branch 'betterdocs-macos'
• Additional commits viewable in compare view

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