[chore] group otel-collector contrib dep update (open-telemetry#36766)

This is to group together PRs that have been done separately and are
annoying as they end up conflicting once one is merged.

See an example with the following 2 prs:

open-telemetry#36757

open-telemetry#36756

Signed-off-by: Alex Boten <223565+codeboten@users.noreply.github.com>

renovate.json

@@ -102,6 +102,12 @@
         "groupName": "All OpenTelemetry Collector packages",
         "matchUpdateTypes": ["major", "minor", "patch"]
       },
+      {
+        "matchManagers": ["gomod"],
+        "matchSourceUrls": ["https://github.com/open-telemetry/opentelemetry-collector-contrib"],
+        "groupName": "All OpenTelemetry Collector Contrib packages",
+        "matchUpdateTypes": ["major", "minor", "patch"]
+      },
       {
         "matchManagers": ["gomod"],
         "matchSourceUrls": [