Add support for Python 3.12 and clean up ini files #488

Job	Run time
Lint	48s
Tests (3.9, git+https://github.com/pastas/[email protected])	1m 52s
Tests (3.9, git+https://github.com/pastas/[email protected])	1m 53s
Tests (3.9, git+https://github.com/pastas/[email protected])	2m 4s
Tests (3.9, git+https://github.com/pastas/[email protected])	1m 54s
Tests (3.9, git+https://github.com/pastas/pastas.git@dev)	2m 57s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 49s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 56s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 51s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 52s
Tests (3.10, git+https://github.com/pastas/pastas.git@dev)	2m 45s
Tests (3.11, git+https://github.com/pastas/[email protected])	2m 3s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 55s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 54s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 54s
Tests (3.11, git+https://github.com/pastas/pastas.git@dev)	2m 50s
Tests (3.12, git+https://github.com/pastas/[email protected])	18s
Tests (3.12, git+https://github.com/pastas/[email protected])	18s
Tests (3.12, git+https://github.com/pastas/[email protected])	15s
Tests (3.12, git+https://github.com/pastas/[email protected])	44s
Tests (3.12, git+https://github.com/pastas/pastas.git@dev)	43s
	34m 35s

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