Add flet-web dependency to pyproject.toml

Author: ndonkoHenri

sdk/python/packages/flet/pyproject.toml

@@ -90,6 +90,7 @@ docs = [
     "mkdocs-external-images",
     "mkdocs-macros-plugin>=1.5.0",
     "flet-cli",
+    "flet-web",
     { include-group = 'extensions' },
     { include-group = 'docs-coverage' },
 ]