[hkimura-intersys]

This PR fixes parsing Preprocessor directives inside dotted DO blocks

Before, an argumentless DO whose dotted block started with (or contained between
dotted lines) an #if / #else / #endif failed to parse:

 I $$$hi d
#if 0  
 . n d
#else   
 . N d,zr
#endif  

I fixed this by adding _dotted_block_pound_if

Scanner changes

• In special #if mode, #endif was only recognised as TAG_END_IF when
  valid_symbols[TAG] was set. It is now also recognised when
  valid_symbols[TAG_END_IF] is set. This covers an #endif directly after a
  post-conditional argumentless DO (D:cond) whose nested .. block
  follows the #endif

Workflow CI Changes

• tree-sitter/parser-test-action upgraded from @v2 to @v3