Add @pytest.mark.lalr1 marker to test_lalr in test_lalr1_but_not_slr.py

[Copilot]

test_lalr1_but_not_slr.py was missing the @pytest.mark.lalr1 decorator on test_lalr(), making it impossible to selectively run LALR1 tests via pytest markers (e.g. -m lalr1).

Changes

• Added import pytest to tests/test_lalr1_but_not_slr.py
• Added @pytest.mark.lalr1 to test_lalr(), consistent with the pattern used in test_arithmetic_grammar.py

@pytest.mark.lalr1
def test_lalr():
    g = grammar()
    parser = g.get_parser("lalr1")
    assert not parser.has_conflicts

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