build(deps-dev): bump highspy from 1.15.0 to 1.15.1

[dependabot]

Bumps highspy from 1.15.0 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)

Commits

• 04024d7 Merge pull request #3127 from ERGO-Code/latest
• 2709311 bazel v
• 2c7468d Merge pull request #3126 from ERGO-Code/version-bump-1.15.1
• b358697 Merge pull request #3122 from ERGO-Code/openblas-libraries-fix
• df4f2cd one more PR
• 1843e34 Features
• cd84991 bazel hconfig
• 9d12ffb version bump
• c90da40 Merge pull request #3119 from Wronskode/fix/wrong_comment_postsolve
• 7363539 Changed how HIPO_USES_OPENBLAS and HIPO_USES_APPLEBLAS are configured, so...
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[codspeed-hq]

Merging this PR will regress 1 benchmark

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 5 improved benchmarks
❌ 1 regressed benchmark
✅ 169 untouched benchmarks
⏩ 175 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	test_to_lp[nodal_balance-severity=0]	2.8 MB	3.3 MB	-15.55%
⚡	Memory	test_to_lp[milp-n=50]	2.6 MB	2 MB	+30.22%
⚡	Memory	test_to_lp[storage-n=250]	35.8 MB	28.9 MB	+23.79%
⚡	Memory	test_to_lp[knapsack-n=10000]	2.6 MB	2.2 MB	+23.11%
⚡	Memory	test_to_lp[merge_balance-severity=0]	3.2 MB	2.6 MB	+21.7%
⚡	Memory	test_to_lp[cumsum-severity=50]	62.4 MB	56.1 MB	+11.23%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing dependabot/pip/highspy-1.15.1 (b4e3678) with master (0f6cdad)²}

Footnotes

1. 175 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on master (09e11ad) during the generation of this report, so 0f6cdad was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩