Update dependabot configuration

The betterproto dependency was removed and we switched back to
frequenz-api-microgrid, so we need to adapt the dependabot
configuration to reflect that.

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

.github/dependabot.yml

@@ -27,19 +27,19 @@ updates:
           - "patch"
         exclude-patterns:
           - "frequenz-client-base*"
-          - "frequenz-microgrid-betterproto*"
+          - "frequenz-api-microgrid"
       optional:
         dependency-type: "development"
         update-types:
           - "minor"
           - "patch"
         exclude-patterns:
           - "frequenz-client-base*"
-          - "frequenz-microgrid-betterproto*"
+          - "frequenz-api-microgrid"
       in-devel-patch:
         patterns:
           - "frequenz-client-base*"
-          - "frequenz-microgrid-betterproto*"
+          - "frequenz-api-microgrid"
         dependency-type: "production"
         update-types:
           - "patch"