Support Tact 1.6.0

[novusnota]

See: https://github.com/tact-lang/tact/blob/main/dev-docs/CHANGELOG.md#160---2025-02-28

After completion of the #45, make sure to swiftly do:

• Update everything in nvim-treesitter, including:
  • nvim-treesitter/nvim-treesitter
  • feat(tact): update queries nvim-treesitter/nvim-treesitter-textobjects#697 (updated existing one with new stuff)
  • nvim-treesitter-context (nothing changed)

[novusnota]

THe context queries didn't change while the main set of queries was successfully merged. The textobject queries PR is the same from the last update even, I've only changed a couple things there to support 1.6.0.

Therefore, I consider this issue resolved :)