chore: Make dependabot group names easier to understand (#136)

The pull requests generated by dependabot can be a bit confusing because
the path disappears from the subject line if we update too many
dependencies at once.
This PR aims to alleviate some confusion by changing the group name
`all-deps` to `root-deps` and `validation-deps`.

Author: nabetti1720

.github/dependabot.yml

@@ -6,7 +6,7 @@ updates:
   allow:
     - dependency-type: "all"
   groups:
-    all-deps:
+    root-deps:
       patterns:
         - "*"
   schedule:
@@ -18,7 +18,7 @@ updates:
   allow:
     - dependency-type: "all"
   groups:
-    all-deps:
+    validation-deps:
       patterns:
         - "*"
   schedule: