Ruby Vector.remove_all does not reset indexes

[Stefan Marr]

See https://github.com/smarr/are-we-fast-yet/blob/master/benchmarks/Ruby/som.rb#L138
vs. https://github.com/smarr/are-we-fast-yet/blob/master/benchmarks/JavaScript/som.js#L135

probably also an issue in Crystal.

[Stefan Marr]

Fixed with:

• 6ea6d0e
• 3f71dd9