Use yaml grammar from tree-sitter-grammars/tree-sitter-yaml

[hectorhon]

I found this, a more recent and maintained version for the yaml language. It fixes a bug I encountered.

I encountered a bug in the current version from ikatyang, where if the yaml key length is too long (more than 126 characters), the corresponding value for the yaml entry is dropped from the parse tree.

How to reproduce the bug without emacs:

1. Visit https://ikatyang.github.io/tree-sitter-yaml/ (link provided in the About section)
2. Enter the following text: a23456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456: sometext
3. Observe that the tree is correct, with a key and value field.
4. Update the text to: a234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567: sometext. Note the extra 7 before the colon.
5. Observe that the tree is incorrect, where the value field is missing.

This bug does not appear in the new repository. I tested this locally in my emacs and the parsing works correctly.

[hectorhon]

The build is failing, I have opened a PR upstream to fix the error.

It was working locally earlier because I used the checked-in src/grammar.json instead of grammar.js.

[jcs090218]

Added in c164b68.