Add testcase for parser__advance assertion failure
Add testcase for parser__advance assertion failure

The python testcase decodes to:
```
00000000  35 63 6f 6e 88 2c 29 33  2c 2c 2c 2c 63 6f 6e 88  |5con.,)3,,,,con.|
00000010  2c 2a 2c 3a 35 63 6f 6e  2c                       |,*,:5con,|
```

which triggers:
```
Assertion failed: ((uint32_t)0 < (&reduction.slices)->size), function parser__advance, file src/runtime/parser.c, line 1202.
```

tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter