Update Buildkite pipeline for the new JuliaGPU cluster. (#44)

Switch to the per-backend queues of the new JuliaGPU cluster.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: maleadt

.buildkite/pipeline.yml

@@ -12,8 +12,7 @@ steps:
             - src
             - ext
     agents:
-      queue: "juliagpu"
-      cuda: "*"
+      queue: "cuda"
     if: build.message !~ /\[skip tests\]/
     timeout_in_minutes: 30
 
@@ -27,8 +26,7 @@ steps:
             - src
             - ext
     agents:
-      queue: "juliagpu"
-      cuda: "*"
+      queue: "cuda"
     if: build.message !~ /\[skip tests\]/
     timeout_in_minutes: 30
 
@@ -42,8 +40,7 @@ steps:
             - src
             - ext
     agents:
-      queue: "juliagpu"
-      rocm: "*"
+      queue: "rocm"
       rocmgpu: "*"
     if: build.message !~ /\[skip tests\]/
     timeout_in_minutes: 30
@@ -58,8 +55,7 @@ steps:
             - src
             - ext
     agents:
-      queue: "juliagpu"
-      rocm: "*"
+      queue: "rocm"
       rocmgpu: "*"
     if: build.message !~ /\[skip tests\]/
     timeout_in_minutes: 30