Add Hessian check for 2-parameter problems #431

Job	Run time
style	12s
Benchmarks	7m 38s
Coverage tests (macos-14 / Python 3.12)	17m 19s
Integration tests (ubuntu-latest / Python 3.12)	27m 9s
Test examples (ubuntu-latest / Python 3.12)	12m 30s
Integration tests (windows-latest / Python 3.12)	27m 9s
Test examples (windows-latest / Python 3.12)	13m 50s
Integration tests (macos-13 / Python 3.12)	22m 52s
Test examples (macos-13 / Python 3.12)	21m 14s
Integration tests (macos-14 / Python 3.12)	10m 0s
Unit tests (ubuntu-latest / Python 3.9)	1m 49s
Test examples (macos-14 / Python 3.12)	5m 46s
Unit tests (ubuntu-latest / Python 3.10)	1m 51s
Unit tests (ubuntu-latest / Python 3.11)	1m 46s
Unit tests (ubuntu-latest / Python 3.12)	2m 1s
Unit tests (windows-latest / Python 3.9)	4m 1s
Unit tests (windows-latest / Python 3.10)	3m 1s
Unit tests (windows-latest / Python 3.11)	2m 50s
Unit tests (windows-latest / Python 3.12)	4m 9s
Unit tests (macos-13 / Python 3.9)	3m 31s
Unit tests (macos-13 / Python 3.10)	4m 2s
Unit tests (macos-13 / Python 3.11)	3m 3s
Unit tests (macos-13 / Python 3.12)	5m 23s
Unit tests (macos-14 / Python 3.9)	1m 24s
Unit tests (macos-14 / Python 3.10)	1m 17s
Unit tests (macos-14 / Python 3.11)	1m 5s
	3h 26m 52s

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