feat(ironic): update for two backports

Backport the following:
- bios.apply_configuration validation https://review.opendev.org/c/openstack/ironic/+/985744
- fix the boot of IPA with multiple out of band steps https://review.opendev.org/c/openstack/ironic/+/984894

Author: cardoe

containers/ironic/Dockerfile

@@ -13,7 +13,7 @@ RUN apt-get update && \
 
 # clone source and patch it
 # renovate: name=openstack/ironic repo=https://github.com/rackerlabs/ironic.git branch=understack/2026.1
-ARG IRONIC_GIT_REF=a21904bdcc7b028aa15f5016c8c7c00d17b1f31b
+ARG IRONIC_GIT_REF=74bddc1d9bc59d549c1fd62d7eee6d6cba984816
 ADD --keep-git-dir=true https://github.com/rackerlabs/ironic.git#${IRONIC_GIT_REF} /src/ironic
 RUN git -C /src/ironic fetch --unshallow --tags