add missed luxon bump changeset

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

.changeset/big-seas-explain.md

@@ -0,0 +1,21 @@
+---
+'@backstage/integration': patch
+'@backstage/plugin-auth-backend': patch
+'@backstage/plugin-bitrise': patch
+'@backstage/plugin-cost-insights': patch
+'@backstage/plugin-fossa': patch
+'@backstage/plugin-git-release-manager': patch
+'@backstage/plugin-github-actions': patch
+'@backstage/plugin-github-deployments': patch
+'@backstage/plugin-ilert': patch
+'@backstage/plugin-jenkins': patch
+'@backstage/plugin-kubernetes': patch
+'@backstage/plugin-pagerduty': patch
+'@backstage/plugin-scaffolder': patch
+'@backstage/plugin-scaffolder-backend': patch
+'@backstage/plugin-sentry': patch
+'@backstage/plugin-splunk-on-call': patch
+'@backstage/plugin-xcmetrics': patch
+---
+
+Update Luxon dependency to 2.x