Lua binding compatibility for lua 5.3+

[owent]

1. luaL_checkint is replaced by luaL_checkinteger and is removed from lua 5.3
2. lua_isinteger is already defined in lua 5.3+
3. else if (isprint(ch)) in upb/bindings/lua/upbc.cc is UB when ch is negative, and will crash when compiled by MSVC.

[github-actions]

We triage inactive PRs and issues in order to make it easier to find active work. If this issue should remain active or becomes active again, please add a comment.

This issue is labeled inactive because the last activity was over 90 days ago.

[github-actions]

We triage inactive PRs and issues in order to make it easier to find active work. If this issue should remain active or becomes active again, please reopen it.

This issue was closed and archived because there has been no new activity in the 14 days since the inactive label was added.