misc: remove deprecated strong-mode flag from analysis_options.yaml
diff --git a/analysis_options.yaml b/analysis_options.yaml
index 3d7fdea..2b0a49b 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -1,5 +1,3 @@
-analyzer:
-  strong-mode: true
 linter:
   rules:
     - avoid_empty_else