Renovate: Pinned versions as allowedVersions packages rules (#4261)

Using Renovate/reconfigure branch to propose Renovate changes:

- Pin versions at Renovate level using `allowedVersions` package rules:
https://docs.renovatebot.com/configuration-options/#packagerulesallowedversions

This PR branch name is `renovate/reconfigure` to make use of
configuration changes preview feature:
https://docs.renovatebot.com/getting-started/installing-onboarding/#reconfigure-via-pr
thus letting us testing the changes before merging.

Simulation: #4261 (comment)

Author: pfcoperez

renovate.json

@@ -34,29 +34,34 @@
     {
       "matchManagers": ["gomod"],
       "matchPackageNames": [
-        "github.com/pingcap/tidb",
-        "github.com/pingcap/tidb/pkg/parser",
-        "github.com/aws/aws-sdk-go-v2/feature/s3/manager"
+        "github.com/PeerDB-io/peerdb/flow/generated/**"
       ],
       "enabled": false
     },
     {
       "matchManagers": ["gomod"],
-      "matchPackageNames": [
-        "github.com/PeerDB-io/peerdb/flow/generated/**"
-      ],
-      "enabled": false
+      "matchPackageNames": ["cloud.google.com/go/bigquery"],
+      "allowedVersions": "v1.72.0"
     },
     {
       "matchManagers": ["gomod"],
-      "matchPackageNames": [
-        "cloud.google.com/go/bigquery",
-        "cloud.google.com/go/pubsub/v2",
-        "github.com/aws/aws-sdk-go-v2/feature/s3/manager",
-        "google.golang.org/api",
-        "github.com/tikv/pd/client"
-      ],
-      "enabled": false
+      "matchPackageNames": ["cloud.google.com/go/pubsub/v2"],
+      "allowedVersions": "v2.3.0"
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchPackageNames": ["github.com/aws/aws-sdk-go-v2/feature/s3/manager"],
+      "allowedVersions": "v1.21.0"
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchPackageNames": ["google.golang.org/api"],
+      "allowedVersions": "v0.257.0"
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchPackageNames": ["github.com/tikv/pd/client"],
+      "allowedVersions": "v0.0.0-20251229071808-6173d50c004c"
     }
   ],
   "vulnerabilityAlerts": {