ci: allow dart_skills_lint in packages

.repo_tool_config.yaml

diff --git a/.repo_tool_config.yaml b/.repo_tool_config.yaml
index 7ac843e..7797e87 100644
--- a/.repo_tool_config.yaml
+++ b/.repo_tool_config.yaml
@@ -113,6 +113,7 @@
     # Google-owned packages
     - _discoveryapis_commons
     - adaptive_navigation
+    - dart_skills_lint
     - googleapis
     - googleapis_auth
     - json_annotation