scripts: update hetzner amd64 instance type

The currently used server type (`cpx11`) was deprecated and will be
removed on 2026-01-01.

- https://www.hetzner.com/news/new-cloud-plans/
- https://docs.hetzner.cloud/changelog#2025-10-16-new-server-types-with-categories
- https://docs.hetzner.cloud/changelog#2025-10-16-server-types-deprecated

Signed-off-by: Julian Tölle <julian.toelle@hetzner-cloud.de>

Author: apricote

ci-automation/ci-config.env

@@ -168,7 +168,7 @@ BRIGHTBOX_PARALLEL="${PARALLEL_TESTS:-1}"
 
 # -- Hetzner --
 : ${HETZNER_IMAGE_NAME:='flatcar_production_hetzner_image.bin.bz2'}
-: ${HETZNER_amd64_INSTANCE_TYPE:="cpx11"}
+: ${HETZNER_amd64_INSTANCE_TYPE:="cpx22"}
 : ${HETZNER_arm64_INSTANCE_TYPE:="cax11"}
 : ${HETZNER_arm64_LOCATION:="fsn1"}
 : ${HETZNER_amd64_LOCATION:="hel1"}