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chore: bump highspy from 1.13.1 to 1.15.1#718

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chore: bump highspy from 1.13.1 to 1.15.1#718
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dependabot/pip/highspy-1.15.1

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Bumps highspy from 1.13.1 to 1.15.1.

Release notes

Sourced from highspy's releases.

v1.15.1

Patch release v1.15.1 fixes:

Apache release binaries not including HiPO fixed in [PR #3112](ERGO-Code/HiGHS#3112).

Build for users with C++20 fixed in [PR #3114](ERGO-Code/HiGHS#3114).

OpenBLAS setup issue affecting performance fixed in [PR #3122](ERGO-Code/HiGHS#3122).

Values passed for string option values (except for file names) are converted to lower case [PR #3108](ERGO-Code/HiGHS#3108).


The highlights of v1.15 are the first variant of the parallel MIP solver and the addition of HiPO in Python.

Code changes

Following [PR #2886](ERGO-Code/HiGHS#2886), our prototype multithreaded MIP solver is available, refactoring the worker/node-search logic of the branch-and-cut solver to run across multiple threads. This is the first release of the parallel MIP solver.

A fix to the parallel scheduler was merged in [PR #3087](ERGO-Code/HiGHS#3087).

Following [PR #2994](ERGO-Code/HiGHS#2994), HiPO can now be used to solve LPs and QPs from highspy, with documentation added in [PR #3024](ERGO-Code/HiGHS#3024) and [PR #3060](ERGO-Code/HiGHS#3060). HiPO performance was further improved by faster handling of free variables ([PR #3013](ERGO-Code/HiGHS#3013)) and faster triangular solves ([PR #3014](ERGO-Code/HiGHS#3014)).

Prompted by #2957, square Hessians that are only slightly asymmetric are now accepted by Highs::qFormatOk, rather than being rejected outright ([PR #2965](ERGO-Code/HiGHS#2965), [PR #2984](ERGO-Code/HiGHS#2984) and [PR #3003](ERGO-Code/HiGHS#3003)). Identification of non-convexity in the QP solvers was also improved, with extended documentation added in [PR #3056](ERGO-Code/HiGHS#3056), and a further bug affecting some QPs was fixed in [PR #3069](ERGO-Code/HiGHS#3069). QP hot start

... (truncated)

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@dependabot dependabot Bot added dependencies Updating or fixing dependencies python Pull requests that update python code labels Jul 5, 2026
@github-actions github-actions Bot enabled auto-merge (squash) July 5, 2026 12:43
Bumps [highspy](https://github.com/ERGO-Code/HiGHS) from 1.13.1 to 1.15.1.
- [Release notes](https://github.com/ERGO-Code/HiGHS/releases)
- [Commits](ERGO-Code/HiGHS@v1.13.1...v1.15.1)

---
updated-dependencies:
- dependency-name: highspy
  dependency-version: 1.15.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot force-pushed the dependabot/pip/highspy-1.15.1 branch from f4330c2 to 49d361f Compare July 7, 2026 15:06
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