Update zsh-syntax-highlighting to 0.7.1
Changes:
- Add ZSH_HIGHLIGHT_DIRS_BLACKLIST to disable "path" and "path prefix" highlighting for specific directories
- Add the "regexp" highlighter, modelled after the pattern highlighter
- When a word uses globbing, only the globbing metacharacters will be highlighted as globbing
- Highlight pasted quotes
- Highlight command substitutions
- Highlight process substitutions
- Highlight command substitutions inside double quotes
- Highlight many precommands
- Highlight numeric globs
- Assorted improvement to aliases highlighting
- Highlight some more syntax errors
- New styles: named file descriptors, RC_QUOTES, and unclosed quotes
- The 'brackets' highlighting no longer treats quotes specially
- Bugfixes