Update bootstrap plans for 9.4.8 and 9.6.4

.gitlab-ci.yml

hadrian/bootstrap/generate_bootstrap_plans

hadrian/bootstrap/plan-9_4_1.json

hadrian/bootstrap/plan-9_4_2.json

hadrian/bootstrap/plan-9_4_3.json

hadrian/bootstrap/plan-9_4_4.json

hadrian/bootstrap/plan-9_4_5.json

hadrian/bootstrap/plan-9_4_6.json

hadrian/bootstrap/plan-9_4_7.json

hadrian/bootstrap/plan-9_4_8.json

hadrian/bootstrap/plan-9_6_1.json

hadrian/bootstrap/plan-9_6_2.json

hadrian/bootstrap/plan-9_6_3.json

hadrian/bootstrap/plan-9_6_4.json

hadrian/bootstrap/plan-9_8_1.json

hadrian/bootstrap/plan-bootstrap-9_4_4.json

hadrian/bootstrap/plan-bootstrap-9_4_8.json

hadrian/bootstrap/plan-bootstrap-9_6_4.json