Exclude repo-config from dependabot grouping

This dependency usually need manual intervention to update, so it's
better to exclude it from the grouping, which usually blocks merging
until the manual intervention happens.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

.github/dependabot.yml

@@ -19,17 +19,25 @@ updates:
     # Major updates are still managed, but they'll create one PR per
     # dependency, as major updates are expected to be breaking, it is better to
     # manage them individually.
+    # We exclude the `frequenz-repo-config` package from grouping as this
+    # dependency is still under development (at branch v0.x.x), so minor
+    # changes typically introduce breaking changes (and patch updates can
+    # potentially too according to semver).
     groups:
       required:
         dependency-type: "production"
         update-types:
           - "minor"
           - "patch"
+        exclude-patterns:
+          - "frequenz-repo-config"
       optional:
         dependency-type: "development"
         update-types:
           - "minor"
           - "patch"
+        exclude-patterns:
+          - "frequenz-repo-config"
 
   - package-ecosystem: "github-actions"
     directory: "/"