Swift 5.10.1 Release

integrate changes from cmark-gfm 0.29.0.gfm.12 and gfm.13 (#61)

* Normalize nomenclature: marker row vs. delimiter row

The code for the table extension used the term 'marker row',
but the spec calls it 'delimiter row'.

This change normalizes the terminology so that it's consistent.

* Update autolink.c

```
../../../../ext/markly/autolink.c: In function ‘postprocess_text’:
../../../../ext/markly/autolink.c:364:31: warning: passing argument 1 of ‘validate_protocol’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  364 |         if (validate_protocol("mailto:", data + start + offset + max_rewind, rewind, max_rewind)) {
      |                               ^~~~~~~~~
../../../../ext/markly/commonmark.c: In function ‘S_render_node’:
../../../../ext/markly/autolink.c:299:36: note: expected ‘char *’ but argument is of type ‘const char *’
  299 | static bool validate_protocol(char protocol[], uint8_t *data, size_t rewind, size_t max_rewind) {
      |                               ~~~~~^~~~~~~~~~
```

* Update commonmark.c

```
../../../../ext/markly/commonmark.c:405:18: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  405 |       emph_delim = "_";
      |                  ^
```

* Fix GHSL-2023-119: prevent quadratic performance by not allowing very deeply nested footnote definitions.

* Fix GHSL-2023-117: store cell index on node so that it doesn't need to be recomputed during rendering.

* Fix GHSL-2023-118: limit number of autocompleted table cells to prevent DOS.

* Expose CMARK_NODE_FOOTNOTE_DEFINION literal value.

In addition, fix a bug where the length of the literal value was
calculated AFTER the actual literal string (null terminated) was
allocated.

* Update src/node.h

Co-authored-by: Phill MV <[email protected]>

* Rename custom_int -> cell_index.

* Add newline

* Remove unnecessary scope.

* Create codeql.yml

* Changelog and version bump for 0.29.0.12

* Fix format specifier for printing a size_t

* Changelog and version bump for 0.29.0.13

* move cell index into node_cell_data

---------

Co-authored-by: Waldir Pimenta <[email protected]>
Co-authored-by: Samuel Williams <[email protected]>
Co-authored-by: Kevin Backhouse <[email protected]>
Co-authored-by: Phill MV <[email protected]>
Co-authored-by: Bas Alberts <[email protected]>
Co-authored-by: Bas Alberts <[email protected]>