Wrong dates for some gems

I'm getting
```
puma                           | 6.3.0         | 1980-01-01
```
but that's not the date [for the used version](https://rubygems.org/gems/puma/versions/6.3.0).
Also here
```
dynamic_form                   | 1.2.0         | 2010-09-05
```
doesn't match [the rubygems info](https://rubygems.org/gems/dynamic_form/versions)
