chore: group passkey-rs crates (#603)

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## 📔 Objective

Passkey crates need to point to the same digest and updated
simultaneously

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Author: coroiu

.github/renovate.json

@@ -20,6 +20,11 @@
       "matchManagers": ["custom.regex", "dockerfile"],
       "matchDepNames": ["rust"]
     },
+    {
+      "matchManagers": ["cargo"],
+      "groupName": "passkey-rs crates",
+      "matchPackageNames": ["passkey", "passkey-client"]
+    },
     {
       "matchManagers": ["cargo"],
       "matchUpdateTypes": ["minor", "patch"],