ci(alt_text): remove unnecessary check of py file

Author: amyheather

.github/workflows/lint_alt_text.yml

@@ -5,12 +5,10 @@ on:
   push:
     paths:
       - '**.qmd'
-      - 'lint_alt_text.py'
       - '.github/workflows/lint_alt_text.yml'
   pull_request:
     paths:
       - '**.qmd'
-      - 'lint_alt_text.py'
       - '.github/workflows/lint_alt_text.yml'
   workflow_dispatch: