astro/kosmorro: fix build with poetry

Reported by:	pkg-fallout

astro/kosmorro/Makefile

@@ -15,6 +15,7 @@ BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}Babel>0:devel/py-babel@${PY_FLAVOR}\
 		${PYTHON_PKGNAMEPREFIX}dateutil>0:devel/py-dateutil@${PY_FLAVOR}\
 		${PYTHON_PKGNAMEPREFIX}termcolor>0:devel/py-termcolor@${PY_FLAVOR}\
 		${PYTHON_PKGNAMEPREFIX}kosmorrolib>0:astro/py-kosmorrolib@${PY_FLAVOR}\
+		${PYTHON_PKGNAMEPREFIX}poetry-core>0:devel/py-poetry-core@${PY_FLAVOR}\
 		${PYTHON_PKGNAMEPREFIX}importlib-metadata>0:devel/py-importlib-metadata@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}Babel>0:devel/py-babel@${PY_FLAVOR}\
 		${PYTHON_PKGNAMEPREFIX}tabulate>0:devel/py-tabulate@${PY_FLAVOR}\