Group dependencies on dependabot updates (#885)

* Update dependabot.yml

* exclude pins: `werkzeug`

---------

Co-authored-by: Tom Christie <[email protected]>

Author: T-256

.github/dependabot.yml

@@ -1,7 +1,12 @@
-
 version: 2
 updates:
   - package-ecosystem: "pip"
     directory: "/"
     schedule:
       interval: "monthly"
+    groups:
+      python-packages:
+        patterns:
+          - "*"
+        exclude-patterns:
+          - "werkzeug"