chore(deps): Bundle ginkgo updates

Problem

Due to updates to ginkgo CLI version specified in `.tool-versions`
and the `ginkgo` Go library version being in different update PRs,
we saw warnings like:

```
Ginkgo detected a version mismatch between the Ginkgo CLI and the version of Ginkgo imported by your packages:
  Ginkgo CLI Version:
    2.16.0
  Mismatched package versions found:
    2.17.0 used by integration
```

Solution

Bundle the update for both in one PR in `renovate` and disable
`dependabot` PRs as we anyways rely on `renovate`.

To ensure that `ginkgo` CLI and library versions do not diverge,

renovate.json

@@ -28,6 +28,14 @@
       "description": "Strip of v prefix from version number in certain github releases",
       "matchPackageNames": ["bosh-cli"],
       "extractVersion": "^v(?<version>.*)$"
+    },
+    {
+      "description": "Group Ginkgo CLI and library updates together",
+      "groupName": "ginkgo updates",
+      "matchPackagePatterns": [
+        "^github.com/onsi/ginkgo$",
+        "^github.com/onsi/ginkgo/v2$"
+      ]
     }
   ],
   "nix": {"enabled": true},