databases/ruby-tiny_tds: update to 2.1.6

2.1.6 (2023-12-04)

* Add Ruby 3.0, 3.1, and 3.2 to the cross compile list
* Fix segfault when asking if client was dead after closing it. Fixes #519.
* Mark alloc function as undefined on TinyTds::Result. Fixes #515.
* Fix Gem installation on Windows by adding default freetds msys path. Fixes
  #522
* Search for freetds in /opt/homebrew when installing on Apple
  Silicon. Fixes #484, #492 and #508.

(taca)