Only include relevant data files in MANIFEST.in

The previous include would pull all .mypy_cache directories too, which are quite
large as they include the SQLAlchemy stubs.

MANIFEST.in

@@ -3,6 +3,5 @@ include README
 include requirements*.txt
 include version.txt
 include swh/lister/cran/list_all_packages.R
-recursive-include swh/lister/*/tests/ *.json *.html *.txt *.* *
-recursive-include swh/lister/*/tests/data/ *.* *
+recursive-include swh/lister/*/tests/data/ *
 recursive-include swh py.typed