Increase memory allocation for ironic-base

We're seeing some CI jobs fail due to the ramdisk running out of
storage. This should increase the memory allocation slightly to
overall hopefully enable CI jobs to pass cleanly without issues.

For stable/2024.1, we also remove the now-defunct codespell job.

Change-Id: Iec639cfc029065e378eb69f09200bf92d2313ee0
Signed-off-by: Julia Kreger <juliaashleykreger@gmail.com>
Signed-off-by: Jay Faulkner <jay@jvf.cc>
(cherry picked from commit ccbc47270f)

zuul.d/ironic-jobs.yaml

@@ -48,7 +48,7 @@
         IRONIC_TEMPEST_WHOLE_DISK_IMAGE: False
         IRONIC_VM_COUNT: 2
         IRONIC_VM_EPHEMERAL_DISK: 1
-        IRONIC_VM_SPECS_RAM: 2600
+        IRONIC_VM_SPECS_RAM: 2750
         IRONIC_VM_LOG_DIR: '{{ devstack_base_dir }}/ironic-bm-logs'
         # NOTE(dtantsur): in some jobs we end up with 12 disks total, so reduce
         # each of them. For don't need all 10 GiB for CirrOS anyway.

zuul.d/project.yaml

@@ -72,8 +72,6 @@
             voting: false
         - bifrost-benchmark-ironic:
             voting: false
-        - ironic-tox-codespell:
-            voting: false
     gate:
       jobs:
         - ironic-tox-bandit