Remove concurrency from nightly/test and release step groups

Author: paolino

.buildkite/release.yml

@@ -37,6 +37,8 @@ steps:
   - group : Nightly
     key: nightly-or-test
     depends_on: main-pipeline-build
+    concurrency: 1
+    concurrency_group: "nightly-or-test"
     steps:
       - label: Push swagger nightly or test
         commands:
@@ -86,6 +88,8 @@ steps:
 
   - group: Release
     depends_on: nightly-or-test
+    concurrency: 1
+    concurrency_group: "release"
     if: build.branch == "master"
     steps:
       - block: Create a release