Update the platform for publishing Linux Bazel binaries (#1910)

Wait until
https://bazel-review.googlesource.com/c/bazel/+/242652/1/.bazelci/build_bazel_binaries.yml
is submitted.
diff --git a/buildkite/bazelci.py b/buildkite/bazelci.py
index 04f501a..73e4685 100755
--- a/buildkite/bazelci.py
+++ b/buildkite/bazelci.py
@@ -419,7 +419,7 @@
     "centos7": {
         "name": "CentOS 7",
         "emoji-name": ":centos: CentOS 7",
-        "publish_binary": [],
+        "publish_binary": ["ubuntu2004", "centos7", "linux"],
         "docker-image": f"gcr.io/{DOCKER_REGISTRY_PREFIX}/centos7",
         "python": "python3.6",
     },
@@ -433,7 +433,7 @@
     "centos7_java11_devtoolset10": {
         "name": "CentOS 7 (OpenJDK 11, gcc 10.2.1)",
         "emoji-name": ":centos: CentOS 7 (OpenJDK 11, gcc 10.2.1)",
-        "publish_binary": ["ubuntu1404", "centos7", "linux"],
+        "publish_binary": [],
         "docker-image": f"gcr.io/{DOCKER_REGISTRY_PREFIX}/centos7-java11-devtoolset10",
         "python": "python3.6",
     },