Update timeout for AMDGPU (#268)

Author: vchuravy

.buildkite/pipeline.yml

@@ -63,7 +63,7 @@ steps:
       queue: "juliagpu"
       rocm: "*"
     if: build.message !~ /\[skip tests\]/
-    timeout_in_minutes: 60
+    timeout_in_minutes: 120
     soft_fail:
       - exit_status: 1