Update spring to 1.7.2 to fix hanging rails console

What does this MR do?

Update spring to 1.7.2.

Why was this MR needed?

This fixes hanging rails console issue.

Related

Fixes https://gitlab.com/gitlab-org/gitlab-development-kit/issues/127

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

cc @grzesiek @jacobvosmaer-gitlab @stanhu

Marked the task Branch has no merge conflicts with master (if you do - rebase it please) as completed

Marked the task Squashed related commits together as completed

Marked the task Branch has no merge conflicts with master (if you do - rebase it please) as incomplete

Marked the task Conform by the style guides as completed

Marked the task Branch has no merge conflicts with master (if you do - rebase it please) as completed

Marked the task All builds are passing as completed

Marked the task Added for this feature/bug as completed

Marked the task API support added as completed

Marked the task CHANGELOG entry added as completed

Marked the task Documentation created/updated as completed

Thanks @ayufan!

Status changed to merged

mentioned in commit f60b48bd

Great!