Dependabot: batch patch-level updates (#292)

## Changes

This PR updates the dependabot policy so that patch-level updates are
grouped. These are generally low-risk, and grouping them reduces
PR/update noise.

Author: asnare

.github/dependabot.yml

@@ -8,3 +8,8 @@ updates:
         - "databricks*"
     schedule:
       interval: "daily"
+    groups:
+      # Patch-level updates are low-risk, and can be batched together into a single PR to reduce update noise.
+      batch-patch-updates:
+        update-types:
+          - "patch"