Update allocations Gem & ignore classes without names

What does this MR do?

1. Updates the allocations Gem to 1.0.5 so it can be used on 2.2/2.3 without crashing
2. Changes the background sampler to ignore classes/modules without a name (as we can't do much with these)

Are there points in the code the reviewer needs to double check?

No.

Why was this MR needed?

Using MRI 2.2 or 2.3 would lead to a segmentation fault in the allocations Gem, sometimes this problem would also occur on 2.1

What are the relevant issue numbers?

Not an issue, but the merge request that highlighted these problems: !3807 (merged)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together