Remove deprecated experimental invariant_booleans lint rule (dart-lang/term_glyph#28)

pkgs/term_glyph/analysis_options.yaml

diff --git a/pkgs/term_glyph/analysis_options.yaml b/pkgs/term_glyph/analysis_options.yaml
index a7d6f2d..99b42ff 100644
--- a/pkgs/term_glyph/analysis_options.yaml
+++ b/pkgs/term_glyph/analysis_options.yaml
@@ -32,7 +32,6 @@
     - file_names
     - hash_and_equals
     - implementation_imports
-    - invariant_booleans
     - iterable_contains_unrelated_type
     - join_return_with_assignment
     #- lines_longer_than_80_chars