build: Update Nomad to v1.11.0 and Go to 1.25

[jrasell]

Spot checked locally that the 1.11.0 node changes are working and testable:

$ nomad node status
ID        Node Pool  DC   Name                Class   Drain  Eligibility  Status
f1c338a3  default    dc1  node-a0b99ac1-0     <none>  false  eligible     ready
f43bf258  default    dc1  jrasell-Y7T14T96N0  <none>  false  eligible     ready

$ nomad node identity get f1c338a3
Claim Key              Claim Value
aud                    nomadproject.io
exp                    2025-11-13T09:12:42Z
iat                    2025-11-12T09:12:42Z
jti                    feb0eadd-fcde-9bf2-bebc-4a812dab5c8f
nbf                    2025-11-12T09:12:42Z
sub                    node:global:default:f1c338a3-8aa4-ea69-8daa-354d39c5efe9:default
nomad_node_datacenter  dc1
nomad_node_id          f1c338a3-8aa4-ea69-8daa-354d39c5efe9
nomad_node_pool        default

[tgross]

LGTM!