Bump version to 0.20.6 #397

Job	Run time
check-linked-issue	3s
determine-changes / detect	8s
coverage	7m 1s
unit-tests (ubuntu-latest, 3.9)	9m 14s
type-check	25s
unit-tests (ubuntu-latest, 3.12)	7m 20s
unit-tests (ubuntu-latest, 3.10)	7m 37s
unit-tests (ubuntu-latest, 3.14)	6m 4s
unit-tests (ubuntu-latest, 3.13)	7m 17s
unit-tests (windows-latest, 3.13)	10m 29s
unit-tests (ubuntu-latest, 3.11)	7m 20s
e2e-python (topological-sort, end_to_end_test_topological_sort_worktree.py, 5)	1m 54s
e2e-python (init-optimization, end_to_end_test_init_optimization.py, 10)	2m 16s
e2e-python (async-optimization, end_to_end_test_async.py, 10)	8m 4s
e2e-python (bubble-sort-unittest, end_to_end_test_bubblesort_unittest.py, 40)	6m 23s
e2e-python (futurehouse-structure, end_to_end_test_futurehouse.py, 5)	2m 6s
e2e-python (bubble-sort-pytest-nogit, end_to_end_test_bubblesort_pytest.py, 70, true)	7m 45s
e2e-python (tracer-replay, end_to_end_test_tracer_replay.py, 10)	3m 8s
e2e-python (benchmark-bubble-sort, end_to_end_test_benchmark_sort.py, 5)	10m 28s
e2e-python (coverage-e2e, end_to_end_test_coverage.py, black)	2m 52s
prek / prek	16s
e2e-js	0s
e2e-java	0s
required checks passed	2s
	1h 48m 12s

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