No concurrency groups

@sondavidb fixed
firecracker-microvm/firecracker#3058 and
having one group doesn't work anymore since we have AMD build.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

Author: Kazuyoshi Kato

.buildkite/pipeline.yml

@@ -65,11 +65,6 @@ steps:
   - wait
 
   - label: ':package: install'
-    # This concurrency group can be removed when one of the below issues are resolved:
-    # https://github.com/firecracker-microvm/firecracker-go-sdk/issues/418
-    # https://github.com/firecracker-microvm/firecracker/issues/3058
-    concurrency_group: "mount rootfs"
-    concurrency: 1
     env:
       GOBIN: "$FC_TEST_DATA_PATH/bin"
     commands: