chore(deps): update dependency jenkins-x-plugins/jx-release-version to v2.8.4 (#1659)

Co-authored-by: jenkins-dependency-updater[bot] <81680575+jenkins-dependency-updater[bot]@users.noreply.github.com>
Co-authored-by: Kris Stern <88480540+krisstern@users.noreply.github.com>

Author: jenkins-dependency-updater[bot]

.github/renovate-entrypoint.sh

@@ -11,7 +11,7 @@ export HELM_VERSION=v4.1.3
 export HELM_UNITTEST_VERSION=v1.0.3
 
 # renovate: datasource=github-releases depName=jenkins-x-plugins/jx-release-version
-export JENKINS_JX_VERSION=v2.8.0
+export JENKINS_JX_VERSION=v2.8.4
 
 # renovate: datasource=github-releases depName=norwoodj/helm-docs
 export HELM_DOCS_VERSION=1.14.2