chore(repo): prevent renovate from upgrating open (#5218)

Open v10 has a single breaking change, in that it requires Node v18+ to
be used. Stencil v4 still supports Node 16, and must continue to use
Open v9 as a result. We cannot drop support for Node 16 without a
breaking change, so we’ll hold off on this work until Stencil v5.

renovate.json5

@@ -144,6 +144,11 @@
       matchPackageNames: ['rollup'],
       matchPackagePrefixes: ['@rollup'],
       groupName: 'rollup,'
+    },
+    // TODO(STENCIL-1088): remove once support for Node v16 is dropped
+    {
+      matchPackageNames: ['open'],
+      allowedVersions: '<10',
     }
   ],
   // Never rebase the branch or update it unless manually requested to avoid noisy PR emails