workflow: replace pnpx with pnpm exec

As `pnpx` is deprecated

Author: haoqunjiang

.husky/pre-commit

@@ -1,4 +1,4 @@
 #!/bin/sh
 . "$(dirname "$0")/_/husky.sh"
 
-pnpx --no-install lint-staged
+pnpm exec lint-staged