[renovate] use custom team: syntax for team name

Author: spalger

renovate.json5

@@ -41,15 +41,15 @@
         enabled: false,
       },
       {
-        groupSlug: '@elastic/charts',
+        groupName: '@elastic/charts',
         packageNames: ['@elastic/charts'],
         reviewers: ['markov00'],
         enabled: true,
       },
       {
-        groupSlug: 'vega related modules',
+        groupName: 'vega related modules',
         packageNames: ['vega', 'vega-lite', 'vega-schema-url-parser', 'vega-tooltip'],
-        reviewers: ['@elastic/kibana-app'],
+        reviewers: ['team:elastic/kibana-app'],
         labels: ['Feature:Lens', 'Team:KibanaApp'],
         enabled: true,
       },