chore: upgrade protobufjs to ^7.5.6 to address CVE-2026-44292

Co-authored-by: Brendan Kellam <brendan@sourcebot.dev>

Author: cursoragent

package.json

@@ -60,6 +60,9 @@
         "smol-toml@npm:^1.6.0": "^1.6.1",
         "teeny-request@npm:^10.0.0": "^10.1.2",
         "uuid": "^14.0.0",
-        "fast-uri@npm:^3.0.1": "^3.1.2"
+        "fast-uri@npm:^3.0.1": "^3.1.2",
+        "protobufjs@npm:^7.4.0": "^7.5.6",
+        "protobufjs@npm:^7.5.3": "^7.5.6",
+        "protobufjs@npm:^7.5.4": "^7.5.6"
     }
 }