Bump mono_repo to v5.0.1 (#150)

Also use latest task names
diff --git a/mono_pkg.yaml b/mono_pkg.yaml
index a1ac6a4..8a0e4ee 100644
--- a/mono_pkg.yaml
+++ b/mono_pkg.yaml
@@ -4,7 +4,7 @@
 
 stages:
   - analyze:
-      - dartanalyzer
-      - dartfmt
+      - analyze
+      - format
   - tests:
       - test