ci: try to fix failing ci

Author: edmondchuc

tox.ini

@@ -20,7 +20,7 @@ setenv =
 commands_pre =
     py3{9,10,11,12}: python -c 'import os; print("\n".join(f"{key}={value}" for key, value in os.environ.items()))'
     py3{9,10,11,12}: poetry check --lock
-    py3{9,10,11,12}: poetry sync --no-root --only=main --only=dev --only=lint --only=tests {env:POETRY_ARGS_docs:} {env:POETRY_ARGS_extensive:} {env:POETRY_ARGS_lxml:} {env:POETRY_ARGS:}
+    py3{9,10,11,12}: poetry install --no-root --only=main --only=dev --only=lint --only=tests {env:POETRY_ARGS_docs:} {env:POETRY_ARGS_extensive:} {env:POETRY_ARGS_lxml:} {env:POETRY_ARGS:} --sync
 commands =
     min: python -c 'import sys; print("min qualifier not supported on this environment"); sys.exit(1);'
     poetry config --list