Update the Docker tag for Swift 5.9 nightly UBI 9 (swiftlang#272)

Author: shahmishal

download/index.md

@@ -519,7 +519,7 @@ but they have not gone through the full testing that is performed for official r
         {% include_relative _build-arch.html platform="Linux" build=ubuntu2204_5_9_builds.first build_2=ubuntu2204_aarch64_5_9_builds.first name="Ubuntu 22.04" docker_tag="nightly-5.9-jammy" platform_dir="ubuntu2204" platform_dir_2="ubuntu2204-aarch64" branch_dir="swift-5.9-branch" arch="x86_64" arch_2="aarch64" %}
         {% include_relative _build-arch.html platform="Linux" build=centos7_5_9_builds.first name="CentOS 7" docker_tag="nightly-5.9-centos7" platform_dir="centos7" branch_dir="swift-5.9-branch" arch="x86_64" %}
         {% include_relative _build-arch.html platform="Linux" build=amazonlinux2_5_9_builds.first build_2=amazonlinux2_aarch64_5_9_builds.first name="Amazon Linux 2" docker_tag="nightly-5.9-amazonlinux2" platform_dir="amazonlinux2" platform_dir_2="amazonlinux2-aarch64" branch_dir="swift-5.9-branch" arch="x86_64" arch_2="aarch64" %}
-        {% include_relative _build-arch.html platform="Linux" build=ubi9_5_9_builds.first build_2=ubi9_aarch64_5_9_builds.first name="Red Hat Universal Base Image 9" docker_tag="Coming Soon" platform_dir="ubi9" platform_dir_2="ubi9-aarch64" branch_dir="swift-5.9-branch" arch="x86_64" arch_2="aarch64" %}
+        {% include_relative _build-arch.html platform="Linux" build=ubi9_5_9_builds.first build_2=ubi9_aarch64_5_9_builds.first name="Red Hat Universal Base Image 9" docker_tag="nightly-5.9-rhel-ubi9" platform_dir="ubi9" platform_dir_2="ubi9-aarch64" branch_dir="swift-5.9-branch" arch="x86_64" arch_2="aarch64" %}
     </tbody>
 </table>