Ignore GRDB (#1052)

Task/Issue URL:
https://app.asana.com/0/1204167627774280/1208651137074643/f
iOS PR: N/A
macOS PR: N/A
What kind of version bump will this require?: N/A

**Description**:
Ignore GRDB

.github/dependabot.yml

@@ -1,6 +1,3 @@
-# Please see the documentation for all configuration options:
-# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-
 version: 2
 updates:
   - package-ecosystem: "gitsubmodule" # See documentation for possible values
@@ -10,4 +7,6 @@ updates:
   - package-ecosystem: "swift" # For Swift package updates
     directory: "/" # Location of Package.swift file
     schedule:
-      interval: "daily"
+      interval: "daily"
+    ignore:
+      - dependency-name: "GRDB"