Fix: deepcopy variables in clone of tax_benefit_system #315

Job	Run time
setup-conda / conda-setup-ubuntu-22.04-np1.26.4-py3.10.6	1m 56s
setup-pip (ubuntu-22.04, 1.26.4, 3.11.9) / pip-deps-ubuntu-22.04-np1.26.4-py3.11.9	24s
setup-pip (ubuntu-22.04, 1.24.2, 3.9.13) / pip-deps-ubuntu-22.04-np1.24.2-py3.9.13	24s
setup-pip (ubuntu-22.04, 1.24.2, 3.11.9) / pip-deps-ubuntu-22.04-np1.24.2-py3.11.9	25s
setup-pip (windows-2019, 1.24.2, 3.11.9) / pip-deps-windows-2019-np1.24.2-py3.11.9	58s
setup-pip (ubuntu-22.04, 1.26.4, 3.9.13) / pip-deps-ubuntu-22.04-np1.26.4-py3.9.13	22s
setup-pip (windows-2019, 1.24.2, 3.9.13) / pip-deps-windows-2019-np1.24.2-py3.9.13	56s
setup-pip (windows-2019, 1.26.4, 3.11.9) / pip-deps-windows-2019-np1.26.4-py3.11.9	1m 3s
setup-pip (windows-2019, 1.26.4, 3.9.13) / pip-deps-windows-2019-np1.26.4-py3.9.13	56s
setup-pip (ubuntu-22.04, 1.26.4, 3.9.13) / pip-build-ubuntu-22.04-np1.26.4-py3.9.13	33s
setup-pip (ubuntu-22.04, 1.24.2, 3.9.13) / pip-build-ubuntu-22.04-np1.24.2-py3.9.13	34s
setup-pip (ubuntu-22.04, 1.24.2, 3.11.9) / pip-build-ubuntu-22.04-np1.24.2-py3.11.9	35s
setup-pip (ubuntu-22.04, 1.26.4, 3.11.9) / pip-build-ubuntu-22.04-np1.26.4-py3.11.9	47s
setup-pip (windows-2019, 1.26.4, 3.9.13) / pip-build-windows-2019-np1.26.4-py3.9.13	37s
setup-pip (windows-2019, 1.24.2, 3.9.13) / pip-build-windows-2019-np1.24.2-py3.9.13	33s
setup-pip (windows-2019, 1.24.2, 3.11.9) / pip-build-windows-2019-np1.24.2-py3.11.9	31s
setup-pip (windows-2019, 1.26.4, 3.11.9) / pip-build-windows-2019-np1.26.4-py3.11.9	33s
test-pip	1s
lint-pip	1s
test-conda	1s
check-version	1s
	12m 11s

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